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I'm going to assume that the given range of 16.4-19.8 ft/sec is plotted as a bell curve and will have the midpoint (18.1 ft/sec) as ideal and giving diminishing returns down both sides. Please correct me if I'm wrong.
The stroke on my Ranger is 94mm (3.7 inches)
My RPM's at 55 MPH are just over 2K (I'll call it 2050)
Putting those numbers through the PS formula, I get right at 21.0 ft/sec. According to the linked thread this is too high. If 18.1 ft/sec is ideal, then I would need to drop my cruising RPM's down to the 1760ish range. 16.4 ft/sec is around 1600 rpm and 19.8 ft/sec is around 1940 rpm.
If all my assumptions and math are accurate, it looks like I would need to drop to a rear axle gear of 3.55 and keep my slightly oversized tires to run 55 MPH at 1790 rpm.
Any insight or advice would be greatly appreciated.
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