I hope I can make the reason for asking my question clear so here goes: The manager at the station I usually go to told me a couple of years ago that their fuel doesn't contain ethanol. I recently saw a tanker there that I don't remember seeing deliver fuel there before. This makes me wonder if the non-ethanol status has changed. I do know that there is a fuel distributor in the same town that does sell non-ethanol retail at their depot but, it's 89 octane. Now, here is where I hope I can make myself clear enough: I fully realize that the octane rating is a measure of how much the fuel resists premature detonation and has no bearing on overall energy content. So my thinking is that the lower the octane rating, the easier the fuel will ignite thereby insuring it would all burn quickly and completely. So, since an Insight is so very sensitive to changes (mpg is already so high that that even a small % shows up as a huge mpg drop), would there be any mpg penalty from going to 89 octane? I do know there would be a $ penalty but I'm wondering about the mpg penalty. I know the owner of the distribution company so the price may not really be an issue anyway.