@m*m^2 idling less than 1 gallon per hour

[dhirocz]

I'll be putting a new apu in my truck later this year. Im not doing it so much for the fuel savings but to cut my use and wear on the truck engine.

I will, however, still idle the truck if it's forcast under 15 deg F though. Even though you can get an Arctic apu... Which is really the same thing as a closed loop apu except it's plumbed into the engine coolant, which is what my truck currently has...I haven't really learned to trust it to keep my fuel from gelling. I worry about the fuel in the lines and the fuel filters, not so much what is in the tanks and engine.