I have a 2000 Chrysler Voyager 3.3 Liter flex-fuel Mini Van, short wheel base. No roof rack. I removed the last row of seats. I drive mostly in city. But I do travel to Baltimore, MD regularly. I drive gently but don't do the extreme hyper mile methods. I also wonder if the ECM can detect higher octane since E-85 is 105 Octane i believe. I'm curious about other flex-fuel users and their results. I'm headed down to Balt. today going to try prem 93 oct. for the whole trip and keeping the speed low like 60 - 62 MPH.