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Re: Pump & meth vs. E85
The best mileage I've got on E85 was 23, the best on gas was between 25 & 26. Even in town I only lose a couple MPG's. I save like $10 per tank, and only lose a couple MPG's, I'm still saving money while making the most HP. I was running the stock o2 on gas, and was running my LC1 for closed loop when I got my best E85 mileage of 23, and it was set for around 11.5:1 (17.25:1 gas equiv AFR) and I was still using the 95 EPROM ECU at the time.
I've been running E85 for a few years in my DSM's and I've never noticed a difference in AFR's throughout the year, and I drive mine all through winter too. If you run closed loop it shouldn't change as open loop uses the high fuel trim (even though loggers don't show it that way), at least on 1g's and 2g's. I'm running full open loop now and I still don't see a difference, even though I'm sure the gas percentage has went up. One of these day's I'll test the fuel to see for sure.
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