Gas Mileage Calculator

A simple method for figuring out fuel economy is to note the odometer reading or zero the trip meter each time you fill the tank. On the next fill‑up, record the distance driven since the last refuel, then split that distance by the gallons (or litres) added on the second stop to get your mileage.

Modify the values and click the calculate button to use
Current Odometer Reading miles
Previous Odometer Reading miles
Gas Added to the Tank gallons
Gas Price (Optional) per gallon

RelatedMileage Calculator | Fuel Cost Calculator

How to Improve Gas Mileage?

Sharing rides, using buses or trains, and even walking or cycling are the top choices for anyone aiming to maximise fuel efficiency. When those alternatives aren’t practical, consider the following tips to squeeze the most mileage out of your vehicle:

  2. Drive a fuel-efficient vehicle– Choose a car that’s built for low fuel consumption – see the comparison chart at fueleconomy.gov/feg/bestworst.shtml for details. Generally, all‑wheel‑drive models consume more fuel than front‑ or rear‑wheel‑drive versions because the engine must power four wheels instead of two.
  4. Tires– Letting the pressure drop reduces fuel economy by roughly 0.3 % for each PSI below the recommended level, as softer rubber wastes energy. Keep the rubber rigid by inflating to the spec printed on the sidewall or listed in the owner’s guide, and have the alignment checked regularly.
  6. When allowed by speed limits, 55 MPH (90 km/h) is best for gas vehicles– Stick to about 55 mph (90 km/h) whenever speed limits allow – the U.S. Department of Energy’s research shows this is the sweet spot for most cars, though exact numbers can differ by model. Whenever you’re on a long, straight stretch, engage cruise control; holding a steady pace cuts the extra fuel burned by repeated acceleration and braking.
  • Don't be aggressive– Avoid hard launches – smooth, consistent driving beats rapid pedal inputs when it comes to mileage. Sudden throttling forces the engine to work harder and burns extra fuel, while abrupt braking wastes energy and wears brakes faster. By keeping your foot gentle, you can boost highway fuel economy by 15-30 % and see gains of 10-40 % in city traffic.
  • Keep vehicles in good shape– Maintain your car – using the oil grade the manufacturer specifies (e.g., 10W-30 instead of a thinner 5W-30) can add 1-2 % to your mileage. Keep the engine tuned, replace a faulty oxygen sensor promptly, and address any emissions failures immediately. Inspect the air filter every few months; a clogged filter chokes airflow and drags down fuel efficiency.
  • Remove unnecessary weight– Lighten the load – physics tells us that more mass means more fuel to push it. Even if you can’t change to a smaller car, clear out any unneeded heavy items from your vehicle. Leave the trailer or roof rack off when you don’t need them, as extra weight and drag will sap your fuel economy.
  • Roll up the windows– Close the windows – open windows create aerodynamic drag that forces the engine to work harder, especially at highway speeds. Keeping them shut (even with the A/C running) usually saves fuel. The same principle applies to roof or bike racks, which add both weight and drag.
  • Air-conditioning– A/C usage – running the air‑conditioner can shave up to a quarter off your mileage in hot weather, as the engine must power the compressor. Keep the temperature moderate and turn the system off while the car idles; the A/C runs more efficiently once you’re moving.
  • Avoid unnecessary idling–An idle vehicle gets 0 mpg.

    • Not only do these tips save drivers money on fuel and maintenance on their vehicles, but being conscious of fuel economy has many positive environmental impacts.

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