DriveCosts

Fuel Economy

MPG Calculator

Track your real-world fuel economy by entering miles driven and gallons used at your last fill-up.

  • Updated for 2026
  • US units
  • US avg fuel prices
  • EPA-style MPG
  • No signup
  • Transparent assumptions
mi
gal
$/gal

Your MPG

0.0mpg

Cost / Mile

$0.000

This Fill-Up

$0.00

How we calculate this

Inputs
All values are user-supplied — change MPG, distance and price to match your situation.
Defaults
Pre-filled with average US fuel prices and EPA-style MPG so the page is useful at first load.
Units
US miles, gallons, MPG and USD throughout. No conversions are applied silently.
Rounding
Displayed to the nearest cent or whole mile; internal math keeps full precision.

Sources & assumptions

  • EPA fuel economy data — City / highway / combined MPG and MPGe baselines.
  • U.S. Department of Energy (fueleconomy.gov) — Vehicle efficiency and EV range references.
  • AAA gas price trends — Recent national and regional retail fuel averages.
  • EIA electricity rates — Average residential per-kWh prices used for EV charging.

We summarize publicly available data — no scraping, no external API calls. Figures are calibrated periodically; use the calculators above for your exact inputs.

How to measure MPG accurately

Fill your tank completely, reset your trip odometer, drive normally, and refill the tank fully again. Divide miles on the trip odometer by gallons added at the second fill-up. Repeat over several tanks for a reliable average.

Why your MPG matters

Real-world MPG is almost always lower than the EPA window sticker — sometimes by 10–20%. Knowing your actual number gives you accurate budgeting and helps spot maintenance issues like dirty air filters or low tire pressure early.

Frequently asked questions

Why is my MPG lower than the EPA sticker?

EPA tests are standardized and don't reflect real driving. Cold weather, short trips, aggressive acceleration, and roof racks all reduce MPG.

How can I improve MPG?

Keep tires inflated to spec, avoid hard acceleration, remove excess weight, use cruise control on highways, and stay on top of maintenance.

Is one tank enough to know my MPG?

A single tank is a starting point. Average 3–5 tanks for a number you can trust.

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