Quote:
Originally Posted by chassis
Weight has a linear effect on energy requirement. Frontal area (drag coefficient) has a cubic effect on energy requirement. Agree that 500lbs of weight isn't explaining the difference in fuel economy.
The 5.3 V8 is a less efficient machine, period. Pushrod, NA, no DI, heavier/more friction rotating assembly, etc. The fuel economy illustrates this. The example given is a pretty good one with similar output and similar size/weight vehicles.
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I think if the Hummer had a manual mated to the 5.3L it would improve the fuel consumption some but not almost 10 MPG. And no turbo engine will never be lag free, you just have to learn how to use the powerband when the engine is tied to a manual transmission. There are tradeoffs, but I sure do like 22 MPG.