Let's use some common sense thinking with this one. If GM could spend just a few dollars more per vehicle and be able to advertise their gas mileage 2mpg higher, don't you think they would? Part of the reason the H3 engine is lacking a little HP is because they are concerned about gas mileage and the Hummer image of being gas guzzlers. If a single spark plug change would do it, then GM would have, but go ahead and spend the money if you don't believe me.
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