Gas vs E85: cost per mile, cost per year, etcThis calculator calculates the true costs of E85 and gas and will help you determine when the E85 pump is cost-effective.
Reduction in green house gases with E85 (per year): .
Blending ethanol and gas
Prior to filling
|tank (gals)||existing %|
(If you're not filling your tank, uncheck this box.)
* Note: in colder areas of the country, the actual percent of E85 gets downgraded to 70% during winter months.2
** You can substitute liters for gallons, if desired, without changing anything.
Octane result from blending 2 fuels
You should be able to find your octane numbers posted on the gas pump.3
|E85 Octane *|
|Set octane to defaults|
|Gas Octane *|
* E85 typically has an octane of 105. E10 may vary from 87 to 93. Premium gas is typically 91. Racing fuel is often 100 or higher.