Especially considering those wheels can only slow him down. Sounds like he needed a dedicated e85 tune for any gains though and I wouldn't want to have to run e85, the flex portion is what makes it great.On E-85 my 5.0 definitely chirped all 4 tires, but it was fast and hooked up. This guys got 4.77 sec 0-60 with his E-85 tune STX SCrew 5.0 that is stock besides an exhaust. He has 3.73. He spun all 4 similarly, but it still hooks up good. I haven’t purchased an E-85 tune because I don’t want to void my warranty, maybe after 60,000 miles.