Ethanol Mix Calculator

Plan your E85 and pump gas mix before you fuel up. Enter your current tank, target blend, and actual ethanol content to see how much of each fuel to add.

Inputs

Tank size (gal) Factory tank capacity

Current fuel level (%) Approx gauge reading

Current ethanol (%) From tester or last mix

Target ethanol (%) Common: E30, E40, E60, etc.

Actual E85 ethanol (%) Test your E85 – often E70–E85

Pump gas ethanol (%) Usually 0–10%

Calculate mix

Results

Add E85 (high-ethanol fuel)

— gal

— L

Add pump gas

— gal

— L

Predicted final ethanol

—%

after topping off the tank

For guidance only. Always verify with an ethanol tester and follow your tuner’s instructions.