• Flex fuel ethanol calculator

    Fuel

    Gasoline ethanol content   %
    E85 ethanol content   %

    Vehicle

    Fuel tank size   gallons
    Current fuel level   %
    Desired fuel level   %

    Ethanol

    Current ethanol content   %
    Desired ethanol content   %

    Results

    E85   gallons
    Gasoline   gallons
    Final ethanol   %
     

    This calculates what blend of gasoline and E85 you need in order to get the right ethanol content in your tank.

    Quick ratios

    Ethanol Pump (E10) E85 (E80)
    20% 6 gallons 1 gallon
    24% 4 gallons 1 gallon
    30% 5 gallons 2 gallons
    40% 4 gallons 3 gallons
    50% 3 gallons 4 gallons