Gas Mileage Calculator
Calculate your vehicle's gas mileage (MPG) from distance driven and fuel consumed. Choose between distance or odometer method. See cost per mile and metric equivalents.
Gas Mileage
25.0 MPG
km/L
10.6
L/100km
9.4
Cost/Mile
$0.13
๐ก MPG = Distance รท Fuel = 300 mi รท 12.0 gal = 25.0 MPG
๐ก How to Use the Gas Mileage Calculator
How to Calculate Gas Mileage
Gas mileage, measured in miles per gallon (MPG), tells you how far your vehicle travels on one gallon of fuel. Higher MPG means better fuel efficiency and lower fuel costs.
MPG = Miles Driven รท Gallons Used
Two Methods to Calculate
Distance Method: If you know the total trip distance and how much fuel you used, simply divide: 300 miles รท 12 gallons = 25 MPG.
Odometer Method: Fill your tank, note the odometer reading. At next fill-up, note the new reading and gallons added. Subtract to get miles driven, then divide by gallons.
What Affects Your MPG?
| Factor | Impact on MPG |
|---|---|
| City vs Highway | Highway is 20โ30% better due to less braking |
| Speed over 60 mph | Each 5 mph over 60 = ~7% worse MPG |
| Aggressive driving | Rapid acceleration/braking = 15โ30% worse |
| Tire pressure (low) | Every 1 PSI low = 0.2% worse MPG |
| AC usage | 3โ4% worse in the city |
| Cold weather | 15โ24% worse (under 20ยฐF) |
| Roof rack/cargo | 2โ8% worse due to wind drag |
Tips to Improve Your MPG
- Maintain proper tire pressure โ check monthly
- Drive smoothly โ gradual acceleration and coasting to stops
- Use cruise control on highways
- Remove excess weight โ every 100 lbs costs ~1% MPG
- Keep up with maintenance โ clean air filter, fresh oil, new spark plugs