Depending on where the pickup has been, it may never have even had any E85 fuel in it. I have a 2007 Avalanche and have never once fueled it with E85 because it just wasn't available or cost so much more. It's been a pretty good vehicle as far as the engine goes. Had some sensor problems that have been aggravating. But all in all, not bad for the 145,000 miles I have driven it. Wishing you good luck in your search.
