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I am curious what RPM everyone it at when on flat highway at 65 mph. If you have any rear end mods please list too.
 

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No mods to the rear, S model so 3.13 gears, (yet) but I've found that at 69 mph if where I get the best economy and the engine is turning at about 2100-2300 rpm. Several mechanics and an engineer have told me that speed seems to be the "sweet spot rpm" for the engine and they are designed to operate the best at that rpm.
 

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You don't have to 'observe' it you can calculate it exactly if you're talking about cruising speed and rpm. Spicer has a nice calculator that will tell you what your speed will be at any engine RPM, if you provide your tire height, final drive ratio and transmission gear ratio. That's all it depends on. HP, Torque etc doesn't matter.
Spicer's Calculator
 
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