I do live outside of Denver, CO; about 5500 feet above sea level. I have the predator as well and do like to watch the black smoke roll on demand but the white/blue smoke seems excessive. This morning I just went to warm it up and counted a full 12 seconds of smoke and it is 44 degrees outside, not exactly cold. I don't understand why it only does it on a cold engine. Obviously it is more extreme at lower temps but I would say I get at least a five second stream of smoke even if the temps are in the 80-90 range.