Ethanol Calculator

Use our free E85 ethanol mix calculator to plan the perfect blend of E85 and pump gas for your performance vehicle. Whether you drive a Subaru WRX, Ford Mustang GT, Mustang EcoBoost, Mitsubishi Lancer Evo, or another ethanol-tuned car, this tool gives you fast, accurate fueling guidance. Select your car from the quick presets, adjust your target ethanol content, and get instant results in gallons and liters.

CamTuned Ethanol Calc

Plan your E-mix precisely before you fuel up.

Presets set tank size and typical targets. All values remain editable.
%
Approximate gauge reading
%
e.g., 10% if you last filled with E10
%
Common targets: E30, E40, E60, etc.
%
Measure with a tester if possible
%
Often 0–10% depending on region
Add E85
— gal
—
Add Pump Gas
— gal
—
Predicted Final Ethanol
—%
—

For guidance only. Always verify ethanol content after fueling.