Why run E85 when you can only tow the speed limit with either fuel? Over the long run on a trip the non E85 guy will keep going past you cause you have to stop for gas more often. I have 350 hp and 800lbs TQ but in a line of cars going down the road we are traveling at the same speed. Only place where I would pass you is in a passing lane going up hill and latter on down the road we would be behind another group of cars. Happens all the time. Only reason for more HP/TQ is to tow a heavier load. If your running E85 and the guy behind you with the same exact setup is running reg, what are you gaining?