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As all cars will vary, the easiest and most accurate route will be to do some experiments with FE instrumentation at different speeds.
I know automatics will drop off once the torque converter opens up, so 45mph (or whenever the TC kicks on) tends to be the best spot for those cars. My car has such low gearing that at 45mph I'd be running 1000-1200rpm, which is only 400-600rpm above idle. When I drive 55mph, my engine rpm is ~1550-1600, so I do take a pretty significant hit...but I wouldn't stay legal otherwise.
Modifying your engine for low-gearing/low-end torque might spell disaster if it is overdone. I imagine massive forces are going into a drivetrain at loads experienced at such slow speeds. This is mitigated w/ aerodynamics and LRR tires, though.
- LostCause
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