Quote:
Originally Posted by Jim_PA
I don't see how you can be so sure of yourself. Fuel mileage isn't necessarily a factor of displacement. It's about efficiency.
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Both being gen1 engines, the efficiency of each is about the same. But generally speaking the 383 will pull in more air (more displacement) and then more fuel to have a good air/fuel ratio.
Same thing holds true with the 5.3L vs 6.0L. 5.3L will be more fuel efficient.