Calculate your car's fuel efficiency in MPG, km/L, or L/100km. Track gas mileage and estimate annual fuel costs.
MPG
29.2
Miles per gallon
L/100km
8.1
Liters per 100km
MPG
29.2
km/L
12.4
L/100km
8.1
You traveled 350 miles using 12 gallons of fuel.
Annual Fuel Cost
$1440
at 12,000 mi/year
Annual CO₂
3.7 tons
carbon dioxide
Cost per Mile
$0.120
Cost per Kilometer
$0.075
Based on 12,000 miles/year at $3.50/gallon
Your vehicle's 29.2 MPG is Average
To calculate MPG: divide miles driven by gallons used. Formula: MPG = Miles Driven / Gallons Used. For example, if you drove 350 miles on 12 gallons: 350 / 12 = 29.2 MPG. For accurate results, fill your tank completely, reset trip odometer, drive normally, then fill again and note gallons added and miles driven.
Fill your tank completely and note the odometer. Drive normally until you need fuel again. Fill up completely and note gallons used and new odometer reading. Divide miles driven by gallons used. Example: 350 miles ÷ 12 gallons = 29.2 MPG.
Driving habits (speed, acceleration, braking), tire pressure (underinflated tires reduce MPG by 0.2% per PSI), vehicle maintenance (air filters, spark plugs), weight (100 lbs reduces MPG by 1-2%), weather (cold reduces efficiency), AC use, and aerodynamics.
Depends on vehicle type. Excellent: 40+ MPG (hybrids, small cars). Good: 30-40 MPG (compact/midsize). Average: 25-30 MPG (sedans, crossovers). Below average: 20-25 MPG (SUVs, larger vehicles). Poor: under 20 MPG (trucks, older vehicles).
At $3.50/gallon and 12,000 miles/year: Improving from 25 to 30 MPG saves $80/year. From 20 to 25 MPG saves $168/year. From 30 to 40 MPG saves $150/year. Small improvements add up significantly over time.
It depends on your typical driving. EPA estimates show both. Highway MPG is typically 20-30% higher than city due to constant speeds and less braking. Most drivers get combined MPG closer to city rating. Track your actual driving for accurate numbers.
MPG
29.2
Miles per gallon
L/100km
8.1
Liters per 100km