MPG calculator: gas mileage, fuel economy and cost per mile
Miles per gallon from two odometer readings and the gallons it took to fill back up, with the fuel cost per mile and the metric L/100 km.
Your numbers
See your resultResult
Fuel economy 6.63 mpg650 miles on 98.0 gallons Fuel cost per mile $0.57 Liters per 100 km 35.5 Cost of this tank $372.40 Stop working this out by handFleetZap fuel logs record gallons, cost and odometer at every fill-up, so fuel economy per vehicle builds up on its own.
See FleetZap Maintenance · Try the demoThe formula
MPG = (Odometer now − Odometer at last fill-up) ÷ Gallons to refill · Cost per mile = Price ÷ MPG
Fill the tank all the way each time, so the gallons you pump are exactly what the miles used. With the example: 650 miles on 98 gallons is 6.63 mpg, about $0.57 of fuel a mile. One tank is noisy; average several fill-ups before judging a truck. The fleet fuel guide covers what moves mpg.
Using the numberWhat to do with it
- A truck whose mpg drops while its routes stay the same needs a look: tire pressure, injectors, dragging brakes or a clogged air filter.
- Compare trucks doing the same work, not trucks on different routes or loads.
- Fuel cost per mile goes straight into your cost per mile; the truck cost per mile calculator takes it from there.
Guides behind this calculator
Fleet fuel management Fuel cards and fuel software Reducing idle timeMore free calculators
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The heart of FleetZap, and everything a maintenance team needs in one place: work orders and preventive maintenance, inspections and the field app, plus a parts store with purchasing, compliance and certificate tracking, multi-location assets with a full lifecycle, and the KPIs that prove it’s working.
- Work orders
- Preventive maintenance
- Procedures, inspections & field app
- Parts & purchasing
- Compliance
- Assets, reports & KPIs
Good to know
How do you calculate MPG?Fill the tank, note the odometer, drive, fill it again and divide the miles driven by the gallons it took. 650 miles on 98 gallons is 6.63 mpg.
How do I find fuel cost per mile?Divide the price per gallon by the mpg. At $3.80 and 6.63 mpg, fuel costs about $0.57 a mile.
Why does my mpg change from tank to tank?Loads, routes, weather, idling and how full the pump fills the tank all vary. Average several fill-ups before comparing vehicles.
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