I have been running my Predator at 85 for a while now and it doesn't smoke much at all. I put it back to 65 yesterday because I was hauling about 8k in concrete blocks and didn't want to get to high on EGT's. Even with the trailer unhooked, it blows more smoke on 65 than 85. 120 will smoke both of them out, but I never run it on a continous basis. I won der why the 65 smokes more? :cool: