Mix pump fuel and E85 to hit your target ethanol % — litres of each + resulting AFR.
Enter the ethanol % of your pump petrol (E10 = 10) and your real E85 (winter blends can be ~70%).
Pick the ethanol content your map is tuned for — E30, E50, E70…
We give the exact litres of pump fuel and E85 for your tank, plus the blend's stoich AFR.
Pump E85 varies from ~50% (winter) to ~85% (summer). Tuning for a fixed ethanol % means you should blend to a known target rather than trusting the pump label.
E30 gives a safe knock-resistance gain on most stock-ish setups; bigger blends (E50–E85) need supporting fuelling (injectors/pump). Match the blend your map was calibrated for.
Yes — stoichiometric AFR drops as ethanol rises (14.7 at E0 to ~9.0 at E100), so injectors and pump must keep up. The tool shows the blend's stoich AFR.
The desktop Softechpro Solutions software corrects checksums for 260+ ECU families and does DPF/EGR/AdBlue/DTC off, Stage tuning and DTC diagnostics offline.
See pricing — €299 one-time