How this calculator works
US: gross range = available US gallons × miles per gallon. Metric: gross range = available liters ÷ liters per 100 km × 100. Usable range = gross range × (1 − reserve percent ÷ 100). Return-turnaround estimate = usable range ÷ 2.
Worked example
With 8 US gallons, 12 mpg, and a 25% reserve, gross range is 96 miles and usable range is 72 miles. The out-and-back turnaround estimate is 36 miles from your starting point.
Common questions
Should I use advertised economy?
Measured fuel use on similar rides is more useful. Start conservatively and update the estimate as you collect trip and refill data.
Are the results stored or sent anywhere?
No. Your entries are used in your browser for this calculation. Calculator entries are not saved. Optional My Machine and checklist preferences are stored locally as described in our privacy policy.