Gasoline not imported by fueling with E85 (per year): .
Reduction in green house gases with E85 (per year): .
(To navigate the form via your keyboard, use "TAB" and "SHIFT TAB" keys.)
Blending ethanol and gas
For most vehicles, E10 (10% ethanol) yields worse mileage than gasoline without ethanol. What many people don't know is that E10 is probably the worst blend and for many vehicles, 20-30% ethanol will give you similar mileage to gasoline with no ethanol.1
Enter your gas tank size, previous ethanol %, and how much gas you added and this calculator will tell you the ethanol % in your tank.
If you want to just calculate the results of mixing blends, check the "ignore vehicle" checkbox.
* 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. 3 You should be able to find your octane numbers posted on the gas pump.