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The biggest problem, and the reason we don't run pump E85 in our races cars, is the quantity of ethanol in pump E85 is never the same (in fact it can easily vary by 15-25% which is huge). So without knowing the quantity of actual ethanol in the gasoline, your tune must be compromise and...

Not sure what's so funny. I'm just pointing out the "not so obvious" to the daily driver guy. The problem is that no street car runs down to empty. So it's always going to be blend. Been there done that. It's not good for a daily driver unless you're surrounded by yellow E85 pumps... lol...

Nothing like a 500hp V8 bolted to a 6 speed and LSD. Light clutch, shifts great. True sports car experience. Do you know the premium people pay in the 911 world for a stick?

When you posted your results isn't the issue. The issue is, driving on a single tune... E85 only, is a problem when you have a 16 gallon fuel tank, and given E85 has about 25% less energy, you're range goes down by 25% (so we're talking about being hard to take on a trip when you need to be...

So the question is... (and I have not researched this... new to S650), is there a flex fuel kit that integrates with the ecu?