Quote:
Originally Posted by Spektyr
Nice explanation. I knew that higher E## gas got fewer MPG, but not the explanation behind it. According to the government study on E30 I read, a modern ECU can adjust the fuel mixture to run E30 even if the car is rated for E10 or E15. I'm not saying that's a good idea, or that it even applies to our specific cars - I'm just saying that's what a study (that may or may not have any bias) said.
So it sounds like if you had an E30 tune on a twin it would be a solid option. Probably not as much power as an E85 tune, but also probably better MPG.
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On most cars you see the biggest gains between E40-50. After that the return diminishes significantly. It's very common to blend down to a lower percentage. It's also less demand on the fuel system.
Flex fuel tune is the way to go. Run whatever.