I usually leave mine on outside temp, but I do flip over to tank avg to see how I'm doing.

One thing really bothers me about this display. I wish the odometer showed me total mileage and one of the trip mileages simultaneously. I need to record the total mileage numbers for work, but at the same time I keep track of total mileage for purposes of gas consumption. So I am constantly flipping the toggle between Total and TripA. I know there is one screen where I can have the Trip odometer on the top and the total on the bottom, but as soon as I switch the Disp, I lose that screen setup. Grrrrr....