M5 Guru (>2000 posts)
Join Date: Aug 2007
Location: West Bend, WI
Thanked 243 Times in 191 Posts
I'm pretty involved in the neon forums (don't laugh). One guy converted his neon to e85 simply by running proportionally larger injectors. The computer assumed stock size injectors so the pulsewidth was modulated according to the AF's that the computer was computing with, only with the larger injectors, a lot more fuel came out.
Here is the funny part. You get much less MPG than you do with 87 or 93 octane even. But after the math you are paying the same per mile. So effectively you have reduced the range of your vehicle, made it so you have a harder time finding a gas station than a diesel and required your fuel filters to be replaced (ethanol supercleans all fuel system components).
Now, I'm not trying to compare a neon to an M5, but the concept and probably application with be very similar.
Also, ethonal actually costs much more than regular gas. The farmers have to plant the corn (using fuel powered equipment) then they harvest and process the corn (fuel again) then it is shipped to an ethonal plant (fuel again) then it is turned into ethonal. The government subsidizes this which makes it cheaper for the consumer. Plus all crop prices go up (not just corn, since more farmers are growing corn as opposed to say, wheat, which makes wheat go up).
Anyway, yes you are technically using less resorces by running on e85, but really I bet it's a wash in the end.
2001 Jet Black M5
2012 Black Ford Raptor
2014 Black Jeep Grand Cherokee Summit
2008 Raven R1 - Being disassembled and sold