Originally Posted by 1967brutus

Everything plays a role, but so far I have not yet seen much influence from an engine running 80 degrees HT all the way up to 135 (this is the range I pass when doing a tow, and it never requires any correction)So I think the main influence is fuel viscosity making the engine a bit leaner.
Diesel (only a slight bit more viscous than gasoline/oil mix) easily changes a half to a full point of CentiStokes on a tempperature change of say, from freezing to 20 deg C, and that is noticable in things like pumping speed or filter differential pressures.

So yes, I think the viscositiy is the main issue. But that is relatively unimportant, because both engine running temp and fuel viscosity are affected by the same parameter: ambient temperature.

It could be worth a try. You progged your own driver, it should be easy to do an experiment. Tthe nasty thing is, it takes a minimum of 6 months to change progging, test in summer, then wait for winter to check the veracity of the claim....

The 20 minutes WOT on 8 oz, I think is pretty close. I have a variable timer as an emulation of a fuel gauge, and it is set at 13,5 minutes for aprox a 25% reserve fuel. Since I can "tune" my fuel curve, this timer is "fairly accurate" regardless of throttle position. So I am inclined to say that yeah, you probably would be running 20 minutes on a single 8 oz tank.