I've got a vacuum gauge as part of the "factory performance gauge pack", and I've noticed that (let's see if I get this right) I get more vacuum in 4th at 50% throttle than I do in 5th at 90% going up long hills --- that tells me that I'm getting better fuel economy in 4th, and I can also find the speed that keeps momentum, but doesn't require extra throttle input. Plus, I just don't like to run over 4k rpms for extended times...but as long as I don't have a carload of people and gear, I can run Donner as fast as I dare.
No, wait, maybe it's that hood scoop slowing you down! Yours has the extra 0.7" lift, or whatever it is, right?
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