How far is it worth driving for "cheap gas?"
Let's say I have a gas station near me (or on my route or whatever), but that I know another gas station elsewhere is selling gas for ten cents less. Is it worth it for me to go out of the way to buy it cheaper?
When I fill up, I usually get about 12 gallons. So, the trip must be worth $1.20 for me to make it. Since gas is about $3.60 right now, I am saving about 1/3 of a gallon of gas to get to this other station.
My car gets about 27 miles to the gallon, so to be worth the 1/3 of a gallon, it must be less than 9 miles (round trip) for me to go out of the way to get it and come back.
This seems like a decent open-ended question for students to fill in with their own numbers for their cars.