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In our area, we have E85.
A friend took an old (non-flex-fuel) mini-van with a 6-cylinder, and changed out the fuel-injectors to a different, larger, size. That basically converts the van to run on only E85 (can't run it on regular gas anymore.)
I'm not sure what else he did to the van (timing, etc.) but he's a pretty good mechanic, and smart guy.
We packed the van full once (I think it was 7 people) and got 28 mpg on a trip through Chicago.
Seemed like a really good vehicle project - burns clean, got good fuel economy, especially considering the city traffic.
There are a number of vehicles out there that are "bi-fuel", that have some disadvantages over just the one fuel or the other. I think that by converting a vehicle to run on just one specific fuel, you can tune it to run really well that way. "Flex-Fuel" vehicles have the disadvantage of needing to be able to run on a mix of anything from 100% gasoline to 85%ethanol/15% gasoline.
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