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Not true... LS5, LS6, L88, L78 any 396 really all 427's fords old side oiler 427 chrylsers old 440 and 426 wedge and hemi none of the above cared much about high rpm's. It all depends on compression ratio and weight of internal parts. Truck motor have a very heavy rotating assembly...

454 truck motors hate high rpm's my old 88 would get 8-9 mpg no matter what you could load it with 15k pounds and push it down a mountain and it would still get 8-9 mpg on the way down. The worst I ever got was 1.3 gallons per mile pulling a CAT 426 with extending boom and rock buckets on a 40...