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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 1-15 of 87 (page 1 of 6).

Latest Guides

Vehicle odometer with 2026 mileage rate planning context
9 min read

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.

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Road trip image for corridor-based EV charging planning
9 min read

AFDC Corridor Data for EV Trip Planning Workflows

AFDC corridor and station resources support reproducible route planning when assumptions and extraction dates are documented.

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Commuter traffic image for mileage reimbursement policy design
9 min read

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.

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Dashboard image for structured CAFE policy research workflow
9 min read

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.

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Vehicle lineup representing federal fuel economy and emissions frameworks
9 min read

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.

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Gas pump nozzle representing crude-to-retail pass-through context
9 min read

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.

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City and highway routes representing deductible trip categorization
9 min read

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.

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Vehicle lineup for DOE petroleum-equivalent fuel economy rule updates
9 min read

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.

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EV dashboard for electricity-data-driven EV budget planning
9 min read

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.

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Fuel price board representing tax-influenced retail pricing
9 min read

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.

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Mileage display representing first-year method selection timing
9 min read

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.

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Fuel price display used for gasoline component breakdown
9 min read

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.

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EV display for home charging and off-peak scheduling
9 min read

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.

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Gas station price display for weekly gasoline trend analysis
9 min read

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.

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Trip meter used to illustrate mileage recordkeeping quality
9 min read

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.

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