Like others said, E85 will make more power the hotter you have the motor on the line to about 180. I'm happy at 160 on the line. When I'm on the return road, I'm back at 160 with one fan,and a small radiator.

On another car that's blown leaving at 160, I'm 180-190 on the return road, but the fan is still able to drive the temp back to 150 before getting to my pit.

I see typically on the switch 20 to 25 degrees as an average. I've converted 30+ cars and 5 of my own. My favorite e85 car right now runs high 4's and it drives to and from the line and never has a temp issue. Before on race gas temperature was a constant concern. Had to be 130 on the line, then 200 at the stripe, and continued to creep up on the way back to the pit. Often seeing 210.