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Well Ernie I'm always careful about blanket statements.
Very rarely does always apply to anything.
The biggest problem with a big engine at low rpm and low load is throttling losses (your foot isn't very far into it, the throttle is almost closed so the engine really has to PULL that air and fuel in)
this is a big advantage of the diesel, no throttle.
It is true however that in many cases, a little engine spinning fast uses more fuel than a big engine spinning slow. Like it or not, highway fuel economy is more linked to aerodynamics than anything, another thing that kills SUV, it's like pushing a brick!
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