One performance gain i've never heard of hurting FE is Advance your timing with running Higher octane fuel, I do it in my el camino i run 91 octane with advanced timing and it saves exactly 1 MPG
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![](http://ecomodder.com/forum/fe-graphs/sig3408a.png)
Tank:
(No actual EPA numbers for car just used F/E numbers when i first got it)
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