Capt J, maintenance only becomes a factor if high rpm are involved. I build and use e85 with fuel injected engines, all I have worked with are already have a fuel system that will handle the e85, the gm ls series. The 82 C10 did 60k miles on a stock 6.0 before I built the 408 for it, and it is still running in another vehicle. That one ran 9.1's and was all stock except for head studs and upgraded rod bolts. It had 130k before I pulled it out of a wrecked truck and slapped it in the hotrod. Only changed the oil and filters in it while I had it. Now, you will have problems with the fuel system on vehicles that have run pump gas their whole lives, e85 cleans everything out of the tank and lines. Always clean or replace when converting fuel types. Remember the early 70's emissions era? Power and mileage reduced by 50% or more in some cases? Cars got 20mpg with 10-1 compression, but EPA mandated lower compression to lower hp and pollution. But those cars polluted even more due to incomplete fuel burn. They even campaigned to hot rodders to lower compression, it would make your engine last longer and pollute less. Yea right. Yes, high ethanol content fuels can cause problems with vehicles that are not built for it. I would never run it in an vehicle that wasn't set up to run on e85, and that includes flex fuel vehicles. They are NOT set up to use e85. They will accept it as an alternative, but they are not properly designed to take advantage of it. If they ever make production engines that are set up to run on it, opinions will change. But, you can not run pump 93 in a vehicle set up for e85, immediate damage would occur. E85 isn't readily available enough in all areas for true e85 vehicles to hit the market though. AMG, I already stated that flex fuel vehicles are NOT e85 vehicles. They will run on it but aren't designed to take advantage of it. There are no production vehicles that are made for e85. That is the whole problem. My original statement was that if someone actually made an e85 engine, fuel mileage wouldn't drop, but performance would go through the roof. People would like the stuff if they were given the proper engine for it. The fuel pumps that fail on e85 aren't built to push it. Seals that aren't ethanol rated wont take it. There are fuel pumps that last just fine on e85. I've got 85,000 miles on an aeromotive a2000 fuel pump. And it is a performance pump that can send 200psi and support 2500hp on e85. People need to quit putting words in my mouth. In the US today, there is no such thing as a production e85 vehicle. There is the flex fuel scam, but it is nothing more than a scam. If there was, more people would love the stuff. Gearheads have found out how to use it, and the performance market has exploded with parts for it. Why? Because it is an excellent fuel when used properly. When the drivetrain isn't set up for e85, a junk drivetrain can cause the ignorant people to blame the fuel. The fuel isn't bad just because people don't understand how to use it.