nitrogen rich air is different than cold air. what i was pointing out is that the nitrogen levels are highest at dusk and a few hours after, as the ground cools, but dissapates as the night goes on, and gets cooler. that is why you seem to have more power at the begining of the night, than 2-3 am, when it's even cooler. it's irrelivent, though, to the matter at hand. just a fun fact. the bottom line is they are boasting more power through cleanliness alone. i never use cleaners, juswt chevron. doesn't cost any extra, never had a problem with water and such, and i've the piece of mind knowing that it's not gonna build up without any nut sweat. we have 2 refineries that supply to all the chains, split up, i.e. cheveron/shell/texico, and the other one has the rest.
like i said, kind of iffy about running harsh cleaners through a 2 stroke. who knows what's compatible with what oil. i say- run whatever clean gas, and let the oil take care of keeping deposits down