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Should I ask my neighbor for gas back?

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We recently moved into a new neighborhood. The next door neighbor came and borrowed a small amount of gasoline for his lawnmower from my wife. No big deal. A week or so later he comes up to me and says, "Give me some gas so I can mow somebody's lawn down the street." I gave him a tank full. Now we see him going up and down the street mowing all kinds of people's lawns and he has never offered to pay back what he borrowed. The only thing I've heard from him since is, "I'm going to mow your yard too!". I just said, "No thanks." and went back in the house.
Should I just forget about this whole thing or should I go over and ask him for some gas back? We secretly call him "Enis".. he kind of looks like a Neanderthal man.