i ran about 4 tanks in my rusty, with the 2.5, and it got the motor at like almost 400 and then my dad was running it in his 2.5 maxx, and his got to 550 and blew the motor right there on the spot, i tried to tune mine after his blew i had it pretty rich and i got the temp down to about 320 which was still way too hot so i just sold the rest of the gallon to somone else, that ran blue thunder all the time and didnt have any problem with it, i went back to trinity monster horsepower and the temp went right back down and the performance jumped.