[litesong]

I have 3 NA cars with many years of data with 87 octane 10% ethanol blends(E10), & many years of data with 87 octane E0. All 3 cars show mpg increases for E0 of 8%, 7% & 5%. All engines run smoother, quieter & with a trace extra low rpm torque, such that less downshifting is needed to ascend hills. 87 octane E0 is comprised of gasoline molecules averaging 87 octane(duh!). 87 octane E10 has ethanol molecules that average 114 octane of which 87 octane gasoline engines, as coming from the factory, are NOT designed to burn efficiently. ALSO, the gasoline molecules must average 84 octane, IF an average octane of 87 is to be created, while blending 10% ethanol. Yeah, even the 84 octane gasoline molecules aren't right for an 87 octane gasoline engine.

Sure, there is a wide range of octane between 91 octane E0 vs. 87 octane E10. AND there is a difference of 3 percentage points in gasoline molecules, comparing 87 octane E10 to 87 octane E0, which doesn't include the ethanol difference. If your 87 octane gasoline engine isn't performing right with 87 E10..... try some 87 octane E0!!!