## Best answer

The formula to calculate gas mileage:Miles driven gallons used to refill the tank. Take the miles traveled (from the trip computer),divide that by the number of gallons used to refill the tank. For example,the trip shows 200 miles since you last filled up,and it took 15 gallons to refill the tank.

## People also ask

### How do you calculate gas mileage for a road trip?

Use AAA to find the average national gas price. Jot down the amount given at the top of the page as your third figure. Take the mileage of the total distance of your trip and divide it by your miles per gallon to get the number of gallons of gas you will need on your trip.

### Does the online gas mileage calculator support gallons and miles?

Our online gas mileage calculator supports both gallons and miles, as well as liters and kilometers. The output is gas mileage in mpg (miles per gallon) or km/l (kilometers per liter), depending on the metric system you chose.

### How do you calculate mpg on a gas tank?

Take the miles traveled (from the trip computer), divide that by the number of gallons used to refill the tank. For example, the trip shows 200 miles since you last filled up, and it took 15 gallons to refill the tank. 20015=13.34 which results in 13mpg.

### How do I calculate my fuel economy?

1 Fill your fuel tank (to the pump cutoff level) 2 Reset the trip computer 3 Drive until fuel is required 4 Fill the tank again (to the pump cutoff level) 5 Make a note of the number of gallons used to re-fill and the miles on the trip counter 6 Reset trip 7 Use the formula below to calculate mpg using your numbers More items…