On the Zumo, you can program in the fuel odo. It's normally set to 200 miles. Then when you get down to oh say 175, a little gas can comes on the screen. You punch that and it will locate the nearest gas stations.
You're supposed to reset it when you fill up, which I apparently did on the first fill up. but I normally don't, so that I have that gas can to instantly find gas at any time, otherwise it's like 4 menu clicks to look for fuel.
I also use my #2 trip odo on the bike for fuel mileage so I dont' need the zumo for that.
-MD