Figured this out in the 1970's. My Dad's '74 V8-472 Cadillac definitely did better by acceleration from a standing start to achieve third gear (top gear) over the shortest time/distance versus a slow or medium pace. It was a matter of not delaying any of the shifts, overall. (And once a "shift kit" was installed, it was even easier). One had to know the exact point and have a good feel for it. (This was with a 2.94 rear gear; on a later 3.21 & V8-500 it was a bit different though not much).
He got better mileage than I did in driving that car, and he -- through his life -- averaged 90k on brake jobs.
Chryslers were easier to "feel" than the competition due to throttle return/linkages, IMO, but all could be "learned" for best mpg tactics. Big blocks were a world of their own.
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