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But some larger vehicles like vans and stuff would get even more terrible mileage if they didn't have the power. Some trucks that have a v8 get better fuel economy than the v6 version cause they don't have to work as hard to do the same amount of work.
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Sounds like that comes from a classic up-sale tactic rather than the facts. If what you say is true (proof please) it could only be true if the bigger engine was much more efficient than the smaller which is possible but not likely. The reasons for a smaller engine (given similar engine designs) in the same vehicle being more fuel efficient than a larger one, have mainly to do with pumping losses, friction, rotational inertia, and weight. For the same HP power output a smaller engine would have less of all these.
This is a general statement but given a very efficient V8 and a very inefficient V6 you could prove me wrong in that particular case. ( I wouldn't put it past Detroit to do this.)
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