How would he deal with them when the gas stations run out or are all infested with zombies?
Now if he had a gun or flamethrower to make hit-and-run shots, and had gotten a group of people to fortify a gas station, that I could see. Although it might be better to get a bike with both pedals and an engine, so that he could get to the zombies without wasting gas, shoot a few, then make a quick getaway.