Two different fuel tanks, there's a nighmare right there!! Are they going to have different nozzle/filler sizes to prevent somebody from putting the E85/gas into the wrong tank? square peg, round peg?? As it is, I'm paranoid about lending my truck to someone, because the might dump gas in, since people are creatures of habit. Around here there is NO E85 to be had whatsoever, so don't bother trying to get maximum power from this mill in my parts. Makes me laugh when I see all these cars/trucks with the "flexfuel" badges.