Maybe because of rumors started at places like this:

http://www.superchevy.com/how-to/additional-tech/1110chp-e85-fuel-switch/

"Additionally, for advice on how to convert a gasoline fuel system and carb over for E85 use, we chatted with Marvin Benoit of Quick Fuel Technology."

"Cooling Effect

Marvin Benoit: In addition to the octane advantage of E85 over gasoline, since it’s an alcohol-type fuel, most motors will generally produce more torque on E85. In fact, we have local NHRA Super Street racers who have had great success running E85. For bracket racers, the lower cost of E85 makes it a great deal. Furthermore, motors will typically run 15-20 degrees cooler on E85 than gasoline. In some cases, that can be enough to solve overheating problems. Ultimately, you can put a bigger motor in a street car with E85 without having to worry about overheating, and have more horsepower thanks to the cooling effect of the alcohol content."