Nice question, twintips! I suspect, to get the BEST out of a tune, it SHOULD be rewritten to account for 10% ethanol. But, since it's really been coming in as a "standard" for the past year or so, it's quite possible our tunes have been written to take the gasohol blend into account.
And, I think if the 87 and 89 blends are E10, then the 91 is too.
The good thing about E10 is, it won't damage a pre flex-fuel engine (at least we think it won't) :lookaround1: I doubt the long term effects are really known yet, kind of like some of the "wonder drugs" that have been pulled off the shelves recently in your favorite drugstore.
It seems to me we are going to have to live with it. Some of us went through a similar experience many years ago when it was decided lead was bad for us and Ethyl gasoline was no longer made available. Suddenly, a whole bunch of high compression engines were left high and dry - mine included. Oh, yea, they came up with an unleaded alternate, but, it was not the same! We can still make those cars run, but, trust me, they don't run like they used to.
Bill would be the one to answer your "tune" change concerns though.
- Jack
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