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Guides, tips, and in-depth articles about fuel economy, gas mileage calculation, and saving money on fuel.

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MPG Basics and Formulas Start with MPG math, conversions, and understanding label metrics. Trip Cost and Fuel Planning Plan road-trip and commute fuel spend with practical budgeting guides. EV Efficiency and MPGe Understand MPGe, charging costs, and apples-to-apples EV comparisons. Maintenance and Driving Habits Improve real-world fuel economy with behavior and upkeep checklists.

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Gas Mileage Calculator Track real MPG or L/100km from fill-up data. Trip Gas Cost Calculator Estimate gallons needed and total trip fuel spend. Cost Per Mile Calculator Compare per-mile costs across vehicles and routes. Gas vs EV Cost Calculator Run an apples-to-apples annual cost comparison.

Showing guides 31-45 of 87 (page 3 of 6).

Latest Guides

SUV and sedan representing a fuel economy tradeoff and the idea of paying more upfront for higher MPG
10 min read

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 price) and a simple...

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City traffic representing commuting and the potential savings from carpooling
9 min read

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 and telecommuting...

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Dashboard energy display representing EV MPGe and charging loss accounting
10 min read

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 testing overview...

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Car engine bay representing why a check engine light can be linked to reduced fuel economy
10 min read

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. FuelEconomy.gov notes that...

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Gas pump nozzle representing estimating CO2 emissions from gallons of gasoline burned
10 min read

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: 8,887 grams of CO2...

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Tire pressure gauge representing how cold weather affects PSI and fuel economy
9 min read

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 gas mileage, and NHTSA...

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Open road representing trip chaining and route planning to reduce fuel use
9 min read

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 trips from a cold start...

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City traffic and highway driving representing how combined MPG blends city and highway fuel economy
8 min read

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 combined fuel economy is...

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Gas station price sign representing how to estimate commute fuel cost by day, week, and month
9 min read

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 for your route and...

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Gas pump price display representing fuel cost per mile calculations
9 min read

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 seconds. Once you have...

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Gas pump price display representing how to calculate cost to fill up a tank
9 min read

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 a tank) into gallons.

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Vehicle maintenance inspection representing whether changing an air filter improves MPG
9 min read

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 economy in older cars...

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Gas pump price display representing how ethanol blends affect MPG and cost per mile
11 min read

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 affect fuel economy,...

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Fuel-efficient vehicle representing how to read the EPA electric vehicle label
10 min read

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 driving range , along...

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Highway driving representing standardized fuel economy tests used to produce EPA label MPG ratings
9 min read

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 better represent...

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