454 vs. 5.3 efi vs. 5.3 carbed

[Super73]

Originally Posted by andrewmp6

A diesel would give you the best mileage out of the truck but the cost up front is higher then a ls swap.A aftermarket company holley i think makes coil pack covers that look like big block valve covers that would mess with people.

Best milage, maybe.. Lowest cost to operate? Probably not.

With 87 octane at aprox $3.40 in California and Diesel at $4.10, if the math was done I bet the 5.3 might win.
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