E85 Ethanol Blend Calculator
Calculate how much high-ethanol fuel and pump gas to add for a fresh tank, an existing fill, or a blend correction.
Fuel mixing plan
Build your ethanol blend
Source fuel measurements
Enter the ethanol reading for each fuel you can buy. Seasonal E85 often tests below its label.
Connect the fuel plan to what the log shows
The calculator gives you a repeatable blend estimate. TuneWorks keeps the vehicle, setup, sessions, and log analysis together so you can verify how the calibration behaves on that fuel.