How many gears does your car have? One of my cars has to do a little over 3000rpm to maintain 70-75 in 5th gear. My other car has to do about 3000rpm to maintain 65-70 in 5th gear.
It all depends on the number of gears your car has and the gearing ratio. The second car I have is geared more optimally for city driving and gets better fuel economy going slower than fast highway speeds.
Having driven several rental cars too I would say anywhere between 2500 to 3000 is reasonable for the average car. If you are driving a vehicle like say a porsche, bmw or audi they may have more gears and may be at a lower rpm at 70mph than your car.
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