Would a Hummer be that much worse on gas than the blue pickup or the SUV they used to pick up Hershall from the bar?
I suppose a lot depends on how quickly the appocolypse happened. If it was fast; as suggested by the abandoned cars along the freeway, you would think gas stations would still have gas in the tanks. Even if the stations "ran out" of gas, the tanks shut off with several hundred litres left in them. It could be pumped out.
And then I wouldn't be too concerned about fuel economy in the long run. I would think that the gas would go stale long before you ran out.
Edit- and to add to Ben's picture; there is quite a difference between hitting another full sized truck, and hitting a zombie.
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