Hey! Did a crazy experiment. Blew up my EVO, so I had 10 gallons of E85 in the garage. Added five gallons at a time for two fill ups and the VX runs like a raped ape!! The Check engine light did come on for a week until I switched back to regular 89. But guess what??? My Butt Dyno says the truck runs better now!!! Idle down to almost 400rpm's and she's a little bit more responsive!!!