Hey Jon,my temp's are usually about 13 to 1400deg with your foot into it.I've never ran the 1/4 to see how temp's are though.My temp's might even drop more once I get my Volant intake and filter,right now I just running my factory box with a k&n.Sometimes it sounds like that filters gonna shoot out the exhaust pipe.My mileage actually seems better now than what my honed stage 2's were getting me.On the hwg. I usually get 20 mpg that's cruising at 75mph.Stock I was getting 21mpg.. Mark.......