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Originally Posted by Alan06SUT
You are making it too complicated. Weight is the biggest thing. Aero only comes into play at higher speeds (hwy mileage). Its all about getting the right motor for the right vehicle. The torque and horsepower curves need to jive with the everyday use/reqirements of the vehicle. An underpowered vehilcle is constantly working to keep up, and adequately powered vehilce remains in the engine's sweets spots longer.
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Agreed, right motor for right vehicle makes a lot of sense. When GM picked the I5 for the H3, mileage was a big consideration. Other engines had advantages in the power department but not better mileage. All Hummers are underpowered for aggressive road driving by American standards, but they are optimized by design to have serious offroad capability. It's all relative, compare the mediocre mileage of the H3 to the really low mileage of an H2 and the difference is significant (20-25% difference). A Hummer is not an Element, but I've heard some have cross-shopped both.
