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 the mazdaspeed platform you can hit mbt with ~e30, so there's not much more power to be made with higher concentrations of eth at least on that platform.
The study you're referring to is likely just the car recognizing it's running lean and adjusting fuel trims in order to maintain near the AFR it wants to hit.
I would imagine it's similar on this platform where a higher concentration of ethanol offers diminishing returns, and you can mitigate much of the negative effects of ethanol with a blend.