Car Model:

Select your car to auto-fill tank size. Choose "Other / Custom" to enter tank size manually.

Tank Size (L):

Your car's total fuel tank capacity.

Fuel Left in Tank (%):

Percentage of fuel currently remaining in your tank right now.

10%

Fuel Currently in Tank:

The fuel currently sitting in your tank and its actual ethanol %. Pick a preset or enter a custom value — tested ethanol content is best.

Base Fuel (to add):

The base (lower-ethanol) fuel you will add — e.g. E20, Gasohol 95, 91/93, E10. Pick a preset then fine-tune the true ethanol % if needed.

Blend Fuel (to mix in):

The high-ethanol fuel you will blend in — e.g. E85 or Ethanol 99%. Pick a preset then fine-tune the true ethanol % if needed.

Target Ethanol Content (%):

Your desired ethanol % after mixing. Pick a preset (E20/E30/E40/…) or enter a custom value.

E85 (Thailand, ~80%) (blend) (L)	E20 (Thailand, ~18%) (base) (L)	Total Fuel

Base Fuel (to add):

The base (lower-ethanol) fuel you will add — e.g. E20, Gasohol 95, 91/93, E10. Pick a preset then fine-tune the true ethanol % if needed.

Blend Fuel (to mix in):

The high-ethanol fuel you will blend in — e.g. E85 or Ethanol 99%. Pick a preset then fine-tune the true ethanol % if needed.

Add Base Fuel (L):

Amount of base fuel you will add.

Add Blend Fuel (L):

Amount of blend fuel you will add.

E85 Blend Calculator