I'll go to the cheapest place along whatever route I'm on, but I don't go out of my way to get cheaper fuel. In my area diesel and gas both still run close to $3.00, and the only way to get it cheaper would be to run 30 miles out of town to save maybe 5-10 cents per gallon. So basically you'd eat up all your savings with the fuel you spent going out of your way, plus you've wasted a bunch of time.
The fact that you guys are all paying a third less for fuel is...annoying.