Here is a spread sheet my daughter developed to determine if it is advantageous to drive out of your way for cheaper gasoline. This works for all vehicles, just plug in the mpg, etc.
No savings just to get gas here. Lucky for me, there's stuff I need to do on the cheap side of town often enough to take advantage of the $0.10 savings. I do wish they'd pick my side of town to be cheap for a while, though...
