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Gas Mileage Calculator Calculate MPG or L/100km from odometer readings or trip distance with fuel cost breakdown. Fuel Cost Calculator Estimate trip fuel cost from distance, MPG, and gas price per gallon or liter. Fuel Miles Per Gallon Calculator In-depth MPG calculator with fuel economy tips, EPA data, and cost-per-mile analysis. Calculate Gas Cost for Trip Estimate total fuel cost for any road trip from distance, MPG, and gas price. Gas vs Electric Car Cost Calculator Compare annual fuel costs between gas and electric vehicles with savings projections. Commute Gas Cost Calculator Calculate daily, weekly, monthly, and annual fuel costs for your regular commute. Fuel Savings Calculator Compare fuel costs between two vehicles to find potential annual, monthly, and 5-year savings. Cost Per Mile Calculator Calculate fuel cost per mile and total operating cost per mile including maintenance, insurance, and depreciation. IRS Mileage Deduction Calculator Estimate federal mileage deductions by tax year and purpose, with trip-log export for recordkeeping. Fuel Tank Range Calculator Calculate how far you can drive on a full tank based on tank size, MPG, and current fuel level. Carpool Savings Calculator Calculate how much you can save by carpooling, including annual savings and CO₂ reduction.

MPG Basics and Calculation Guides Core formulas, unit conversions, MPG interpretation, and foundational fuel-economy concepts. Trip Cost and Fuel Planning Guides Road-trip budgeting, commute fuel spend, cost per mile, and route-planning strategies. EV Efficiency and MPGe Guides MPGe, kWh/100 mi, charging losses, EV range, and fair gas-vs-EV comparisons. Maintenance and Driving Habit Guides Tire pressure, weather, idling, aggressive driving, and practical MPG improvement habits.

2026 Mileage Rates Explained: Business, Medical, Moving, and Charity IRS Notice 2026-10 publishes category-specific rates for 2026 and should be applied only after trip categorization and record validation. AFDC Corridor Data for EV Trip Planning Workflows AFDC corridor and station resources support reproducible route planning when assumptions and extraction dates are documented. Building a Mileage Reimbursement Policy with IRS and FAVR Rules A defensible reimbursement policy requires explicit categories, source-linked rates, and routine record quality controls. CAFE Public Information Center: A Practical Research Workflow A source-first research workflow reduces status confusion in CAFE analysis and makes policy interpretation more reproducible. CAFE vs EPA Emissions Standards: Why Two Federal Systems Exist NHTSA CAFE and EPA emissions standards are related but distinct systems. Clear boundaries improve policy interpretation and planning decisions. Crude Oil vs Retail Gasoline: Understanding the Pass-Through Crude prices matter, but retail gasoline reflects more than one component; understanding those layers improves planning quality. Deductible vs Nondeductible Miles: Business Driving Rules Explained Mileage accuracy depends on trip classification first, then arithmetic. Category discipline is the foundation of defensible deduction math. DOE’s 2026 Petroleum-Equivalent Fuel Economy Rule: What Changed DOE published petroleum-equivalent fuel economy rule actions in January and February 2026. Reading both records together improves interpretation accuracy. Electric Power Monthly for EV Budgeting: A State-Data Workflow A fixed monthly electricity assumption update cycle improves EV charging-cost planning accuracy and reduces stale-budget risk. Federal and State Gasoline Taxes: How to Read EIA Tax Tables Tax treatment is a structural part of fuel pricing, so tax context should be explicit in every cross-state comparison. First-Year Rule for the Standard Mileage Method: What IRS Guidance Says Method timing decisions can affect future flexibility. The first-year choice should be planned early, with records built to support the selected path. Gasoline Price Components: Crude, Refining, Distribution, and Taxes Retail gasoline is a composite price. Breaking it into components creates better budgeting decisions than headline-only interpretation. Home EV Charging and Off-Peak Rates: A Practical Setup Guide EPA home charging guidance highlights setup and scheduling decisions that can materially affect charging cost consistency. How to Read the EIA Weekly Gasoline Price Update EIA publishes recurring retail benchmarks that are useful for planning when interpreted as trend context, not same-day station guarantees. IRS Mileage Log Requirements: What Counts as Adequate Records Good mileage deductions start with good records. IRS guidance emphasizes adequate substantiation and consistent trip-level detail. IRS Standard Mileage Rate vs Actual Expense Method (2026) IRS guidance allows standard mileage and actual expense methods. Method choice should balance rules, records, and practical maintainability. Level 1 vs Level 2 Charging: Cost, Speed, and Use Cases Level choice should be driven by real usage pattern and charging-window constraints, not generic rankings. Monthly Fuel Budgeting with EIA Data and Your MPG A clean monthly budget workflow combines public market context with private usage data and a consistent variance-review process. NEVI Minimum Standards: What Federal Funding Requires NEVI requirements are best interpreted by pairing DOT summary material with Federal Register full-text rule language. Refinery Data for Drivers: Reading the Weekly Supply Report Weekly supply context can improve fuel-price interpretation when used as explanatory input, not as a one-release forecasting shortcut. SAFE Vehicle Rule III Hearing Process: How Public Input Works Hearing notices are process documents. Reading them correctly helps planners separate timeline signals from final technical requirements. SAFE Vehicle Rule III: What the December 2025 Proposal Covers The December 2025 Federal Register proposal describes suggested CAFE recalibration. Proposal status should be tracked separately from final-rule status. State vs National Gas Price Data: An Apples-to-Apples Method State and national series are both useful only when definition, timing, and tax treatment are aligned before interpretation. Using the 2026 Fuel Economy Guide as a Research Dataset The 2026 guide, downloadable files, and web services can be combined into a reproducible research pipeline with clear version controls. Using the STEO for Gasoline Price Planning STEO is strongest when used for planning ranges and scenario framing, then reconciled against observed weekly market data. Mileage Deduction Calculator (2026): IRS Rate, Formula, and Log Template The IRS standard business mileage rate for 2026 is 72.5 cents per mile . A useful mileage deduction calculator should support tax-year rate changes, purpose-specific... Best Gas Mileage Cars 2026 The best gas mileage cars in 2026 are led by hybrids like the Toyota Prius (57 MPG combined) and Honda Civic Hybrid (49 MPG combined), which deliver dramatically... “You Save/Spend More Over 5 Years” on the EPA Label: What It Means The “ You Save/Spend More Over 5 Years ” line on the EPA fuel economy label is a standardized fuel-cost comparison. It estimates how much more or less you would spend... Aggressive Driving and Gas Mileage: What the Data Shows Aggressive driving—rapid acceleration, hard braking, and speeding—can reduce fuel economy. DOE’s fuel-saving guidance provides ranges for how much... Beyond Tailpipe: Comparing Upstream Emissions with FuelEconomy.gov Tailpipe emissions are only part of a vehicle's emissions footprint. FuelEconomy.gov provides a "Beyond Tailpipe Emissions Calculator" that combines tailpipe... Break-Even MPG Payback: When Higher MPG Pays for Itself "Payback" answers one question: How long does it take for fuel savings to cover a higher upfront price? You can model this with three inputs (miles, MPG, and fuel... Carpool Savings: How to Calculate Cost and CO2 Reduction Carpooling can reduce the number of vehicles on the road and, for participants, reduce fuel spending by sharing trips. DOE’s fuel economy guidance includes carpooling... Charging Losses and MPGe: What the EPA Test Accounts For "Charging losses" are the difference between electricity drawn from the outlet and electricity stored in (and later delivered from) the battery. EPA's plug-in vehicle... Check Engine Light and Fuel Economy: When a Fault Can Cut MPG A check engine light means the vehicle's onboard diagnostics detected an issue. Some issues primarily affect emissions; others can also reduce fuel economy.... CO2 Per Gallon of Gas: A Simple, Sourced Way to Estimate Emissions If you want to estimate tailpipe CO2 emissions from gasoline use, you need one reliable conversion factor and a clear boundary. EPA provides a commonly used factor:... Cold Weather Tire Pressure: PSI Drops, TPMS, and Next Steps Tire pressure often drops when temperatures fall, and underinflation affects both safety and fuel economy. FuelEconomy.gov notes that underinflated tires can lower... Combine Errands to Save Fuel: The Cold-Start Problem Explained One of the simplest ways to reduce fuel use is to combine errands so you take fewer short, cold-start trips. DOE’s fuel economy guidance notes that several short... Combined MPG Explained: The EPA’s 55% City / 45% Highway Weighting The EPA’s Combined MPG is designed for quick comparisons, using a standardized mix of city and highway driving. EPA’s gasoline label documentation explains that... Commute Gas Cost: Daily, Weekly, Monthly (Formula + Examples) Your commute fuel cost is a simple multiplication problem once you convert everything to cost per mile (or cost per kilometer). The key is using the right MPG number... Cost Per Mile (Fuel): The Simple Formula + Examples Fuel cost per mile is a budgeting metric: it tells you how much you spend on fuel for each mile you drive. You can calculate it from your gas price and your MPG in... Cost to Fill Up: Formula, Examples, and a Quick Calculator "Cost to fill up" is a simple multiplication problem once you estimate how many gallons you will buy. The only tricky part is translating your fuel gauge (fraction of... Does a New Air Filter Improve MPG? What FuelEconomy.gov Says "Change your air filter to boost MPG" is a common claim, but it's only sometimes true. FuelEconomy.gov explains that replacing a clogged air filter can improve fuel... E10 vs E15 vs E85: How Ethanol Blends Affect MPG and Cost Ethanol blends often trade lower energy per gallon for different pricing and availability. FuelEconomy.gov provides baseline estimates of how E10, E15, and E85 can... EPA Electric Vehicle Label Explained (MPGe, kWh/100 mi, Range) The EPA’s electric vehicle (EV) label is designed to make EVs comparable — to each other and to gas cars. The label explains MPGe , kWh per 100 miles , and... EPA Fuel Economy and EV Range Testing: The 5-Cycle Method in Plain English The MPG numbers on an EPA label come from standardized test procedures. EPA explains that modern label values reflect a set of tests and adjustments intended to... EPA Plug-in Hybrid Label Explained (MPGe, Gas MPG, Range) Plug-in hybrids (PHEVs) can run on electricity for some miles and then switch to gasoline. EPA provides official plug-in hybrid label documentation (interactive and... Estimated Annual Fuel Cost on the EPA Label: Assumptions and How to Adjust The EPA label’s Estimated Annual Fuel Cost is a standardized estimate intended for comparisons across vehicles. EPA explains in its interactive label that the... EV Charging Cost Per Mile: How to Calculate It (Home and Public) To estimate EV charging cost per mile, you need two inputs: energy use (often shown as kWh per 100 miles ) and your electricity price (in $/kWh). Multiply them (with... EV Efficiency Metrics: MPGe, kWh/100 Miles, Range, and Cost EV shopping gets easier once you separate four ideas: energy efficiency (MPGe), electricity use (kWh per 100 miles), range (miles per charge), and cost (dollars per... EV Range in Cold Weather: What Changes and How to Plan Cold weather can reduce EV range because winter driving often requires cabin heat and changes battery and road conditions. FuelEconomy.gov provides a cold-weather... Flex Fuel Vehicles: How to Tell If You Can Use E85 E85 is a high-ethanol fuel that can only be used in flex-fuel vehicles (FFVs) . FuelEconomy.gov provides a practical checklist for identifying an FFV (labels, fuel... Fuel Cost per 100 Miles: A Better Way to Compare Cars “Cost per 100 miles” translates fuel economy into dollars. It is simple: take your gas price and your MPG and compute how much you spend to go 100 miles. This works... Fuel Economy in Cold Weather: Why MPG Drops (and What to Do) Cold weather can reduce fuel economy for gas, diesel, hybrids, and EVs — but the mechanisms differ. FuelEconomy.gov summarizes the real-world impacts and... Fuel Economy in Hot Weather: AC, Heat, and Real-World MPG Hot weather can reduce fuel economy for both gas cars and EVs, but the reasons differ. FuelEconomy.gov summarizes that air conditioning can significantly reduce MPG... Fuel Economy Maintenance Checklist: Tires, Oil, Sensors, and Simple Checks Maintenance is not the only driver of MPG, but it can prevent efficiency losses from stacking over time. FuelEconomy.gov (DOE) lists specific maintenance items that... Fuel Economy Myths: What’s Fact vs Fiction (DOE) There’s no shortage of “MPG hacks” online. DOE publishes a “Fuel Economy Fact and Fiction” guide that addresses common claims about fuel-saving techniques. The big... Fuel Economy vs Greenhouse Gas Ratings: How the EPA Label Connects Them The EPA label includes both fuel economy (MPG) and a Greenhouse Gas (GHG) rating on a 1–10 scale. For gasoline vehicles, these are closely linked because... FuelEconomy.gov API Guide: Pull MPG and Cost Data FuelEconomy.gov provides XML web services endpoints that let you fetch vehicle menus (year, make, model) and vehicle details programmatically. This is useful if... Gallons per 100 Miles Explained (Fuel Consumption Rate) Gallons per 100 miles is a fuel consumption metric shown on the EPA label for gasoline vehicles. Unlike MPG, it maps directly to fuel used and therefore to fuel cost... Gas vs Electric Cost Per Mile: How to Compare Fairly A fair “gas vs EV” comparison uses the same unit on both sides: dollars per mile (or dollars per 100 miles). For gasoline, that’s gas price divided by MPG. For EVs,... How to Calculate Driving Range on a Tank (and Add a Safety Buffer) Driving range on a tank is a simple formula: tank size × MPG. The hard part is choosing a realistic MPG (because speed, traffic, weather, and maintenance change it)... How to Download FuelEconomy.gov Data (CSV) for Research FuelEconomy.gov (DOE) provides downloadable fuel-economy datasets (CSV) covering vehicle MPG, MPGe, fuel type, and related fields. It's a strong source for building... How to Use FuelEconomy.gov to Compare Cars (MPG, Cost, and Labels) FuelEconomy.gov is the U.S. Department of Energy’s official consumer site for fuel economy information, including MPG ratings, estimated fuel costs, and printable... Idling Fuel Use: How Much Fuel Can Idling Burn? Idling burns fuel while you get zero miles per gallon. DOE’s fuel-economy guidance notes that idling can use roughly one-quarter to one-half gallon of fuel per hour ,... kWh per 100 Miles Explained: The EV Metric That Maps to Cost For electric vehicles, kWh per 100 miles is a fuel-consumption metric — just like gallons per 100 miles for gasoline cars. Lower kWh/100 miles means the vehicle... Motor Oil and MPG: Viscosity, Labels, and What Matters Motor oil affects internal friction, and using the correct viscosity is part of keeping a vehicle running as designed. FuelEconomy.gov states you can improve gas... Planning Refuel Stops on a Road Trip: A Simple Method Fuel-stop planning is easier when you separate trip cost from trip logistics . Cost is based on total gallons used and fuel price. Logistics is based on your... Roof Cargo Box vs Rear Cargo Carrier: Which Hurts MPG Less? Roof-mounted cargo (racks, boxes, baskets) can reduce fuel economy because it increases aerodynamic drag. A rear cargo carrier can also hurt efficiency (it still... Roof Racks and MPG: How Drag Impacts Gas Mileage Roof racks and roof-mounted cargo boxes can reduce fuel economy because they increase aerodynamic drag. DOE’s fuel-saving guidance provides ranges for how much roof... Short Trips vs Long Trips: Why Cold Starts Use More Fuel Short trips often have worse MPG because engines spend a bigger share of the drive warming up and running less efficiently. DOE’s fuel economy guidance notes that... Smog Rating on the Fuel Economy Label: What It Measures The EPA fuel economy label includes a Smog rating on a 1–10 scale. It summarizes tailpipe pollutants that contribute to local air pollution (often called... Speed and Fuel Economy: What Happens Above 50 MPH Speed has a measurable effect on fuel economy. The U.S. Department of Energy notes that gas mileage typically decreases rapidly at speeds above 50 mph and that... Stop-and-Go Traffic and MPG: What You Can (and Can’t) Control Stop-and-go traffic often lowers MPG because it involves repeated acceleration and braking and often increases time spent idling. DOE and AFDC fuel-economy guidance... The MPG Illusion: Why MPG Isn’t Linear (and What to Use Instead) MPG is a useful number, but it’s not linear. The same “+10 MPG improvement” can mean very different fuel savings depending on where you start. That’s why EPA includes... Tire Pressure and Fuel Economy: What Agencies Say (and How to Estimate Cost Impact) Tire pressure is one of the most practical "small levers" for fuel economy because it's easy to measure and correct. FuelEconomy.gov summarizes the impact of... Understanding the EPA Fuel Economy Label (City, Highway, Combined MPG) The EPA fuel economy label is a standardized window sticker for new vehicles that helps you compare fuel use, costs, and emissions across models. The most prominent... What Is MPGe? How Electric Car Efficiency Is Measured MPGe means miles per gallon equivalent . It is used for plug-in electric vehicles (including battery-electric vehicles and plug-in hybrids when running on... Does Air Conditioning Use More Gas? Yes, does air conditioning use more gas is a question with a definitive answer—running your car's AC can reduce fuel economy by 5% to 25% depending on driving... Highway vs City MPG: Why They Differ and What It Means Highway MPG is typically 20–30% higher than city MPG for conventional gasoline vehicles because steady-speed cruising is far more fuel-efficient than the... How Do You Calculate Your Miles Per Gallon? To calculate your miles per gallon (MPG), divide the total miles you drove by the number of gallons of fuel used. Fill up your tank, reset your trip odometer, drive... How Much Does It Cost to Drive 1000 Miles? The cost to drive 1,000 miles ranges from about $50 to $200 or more, depending on your vehicle's fuel economy and the price of gas—a sedan averaging 30 MPG with... How to Calculate Fuel Cost for a Road Trip To calculate fuel cost for a road trip, divide your total trip distance by your vehicle's miles per gallon (MPG), then multiply by the current price per gallon of... How to Save Money on Gas Learning how to save money on gas can cut hundreds of dollars from your annual fuel budget through smarter driving habits, regular vehicle maintenance, and strategic... Is Premium Gas Worth It? Premium gas is only worth the extra cost if your vehicle's owner's manual specifically states that it is required—not merely recommended—because engines... MPG to L/100km: How to Convert Fuel Economy Units To convert MPG to L/100km, divide 235.215 by your US MPG figure—for example, 30 MPG equals roughly 7.8 L/100km. If you are working with Imperial (UK) MPG,... What Is Good Gas Mileage for a Car? Good gas mileage depends on vehicle type, but as a general benchmark, any car achieving 30 MPG or higher is considered fuel-efficient, while the overall U.S. fleet... Why Is My Car Getting Bad Gas Mileage? If you are asking "why is my car getting bad gas mileage," the answer usually comes down to a maintenance issue, a worn component, or driving habits that increase...