[JohnRedS]

As a person in the gas business, here are two cents about BTUs. Ethanol contains 92,000 BTUs per gallon, regular no lead comes in at 132,000. Personally, I have run both 93 E10 and 90 REC Gas without an obvious difference in performance. As a previous poster pointed out, octane and energy are not one in the same. I do have serious misgivings about ethanol in general and storage with ethanol blended fuels in particular. Phase Separation can be a real issue in a fairly short period of time. Our suppliers claim a 90 day shelf life on blended fuels. If you do not have access to pure gas for storage, modern additives seem to be pretty effective in delaying it.