Fuel Distance Calculator How far you can drive on a tank. Fuel in tank (gal) Fuel economy (mpg) Range mm cm m km ft yd mi AU ly 0.2796 Step-by-step with your numbers: 1. Values used: 2. Fuel in tank = 15 gal 3. Fuel economy = 30 mpg 4. Range = 0.2796 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! How far a full tank takes you. FAQ Reserve? Subtract ~1–2 gallons for the reserve. Related calculators Fuel Cost Calculator Estimate the fuel cost of a trip. Gas Calculator Find gallons and cost for a trip. MPG Calculator Calculate fuel economy in miles per gallon.