e85 or stay with pump gas

flyfish said
If you don't increase the fuel volume by ~ 30% you will not only make less power, but you will also lean out your motor and hurt it. Yes, if run properly it will get much less MPG, but at a much lower cost you usually come out ahead...if you were running 87 octane pump gas in the first place then it is probably a wash...if you were running premium or race gas you will save $ at the pump.

By the way...what type of metal was underneath that nasty black corrosion, cast iron, steel? Just curious what might be going on there. :)

I have seen many write ups where folks take the "Pepsi Challenge" on Flex fuel vehicles with E10 vs E85. The numbers I have seen thrown around is that E85, gallon for gallon, produces 25% less energy than E10, while costing 10% less (than regular) so you don't win with E85. But if you are running high compression or a boosted engine, I doubt hypermiling is in your 5-10yr plan in the first place :thumbsup:

IQ52 said
I'm no E85 fan. But it's difficult to blow up an engine by being too lean on E85.

you are making big numbers, very impressive, but detonation is detonation, doesn't matter if it's from E10 or E85, you can easily hurt the motor. Kind of like the old saying "Friendly Fire isn't"