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It's possible to have too slow a cruise rpm to be efficient.
V8 in small truck with max fe seems like it won't happen. How/why have so much torque available only to be confronted with the choice between using it and getting poor economy or having all that power available and not being able to tap into it without ruining the fe for the tank?
Assuming the V8 is a good idea I'd think the smaller the better. Valve shrouding = no issue because if it is an econo build it will have small valve heads and it will live in the low rpm operating range where heavy breathing doesn't happen.
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