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Originally Posted by Pat
I've also found non-ethanol blended gas can improve performance, but certainly not 10% in MPG. I've seen a couple HP and maybe a fraction of one MPG difference. I've also measured small timing differences.
disclaimer: this was all on my 1999.5 A4 turbo.
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In my 2006 Boxster S I easily go from 22-24 MGP to over 26 MPG.
In my 1997 911 (993) Turbo I easily go from 14-16 MPG to over 18 MPG.