I tried running some cool/cold fuel before, can't remember how cold it was but was in a cooler for 20 minutes or so and felt cold. Motor ran cooler of course, also ran rich, ran the whole tank out to see if the tune would change any from the chassis, tank, etc.. warming up and it didn't change much at all throughout the tank. I don't think you would gain any power inscreases, maybe a slight mileage improvement b/c you would have to lean the motor back out for it to run good, but for how rich it was and how much slower from that the motor would have had same power as with non chilled out fuel, so I was over it and didn't run it anymore. If you did choose to run that at a race you would have a very difficult time keeping the fuel the same temp and the motor running the same from that b/c it's going in and out of the cooler and what are you going to do with a cooler in the pits, then chance of some water getting into the tank also. Too much headache and inconsistency I'd think.