If the car is broken in properly, there's no reason to worry about cruising at any speed as long as you're above 1500 RPM. Not true for ALL motors, but it's a good rule of thumb. I cruise in final gear at 40 all the time in all the manuals I drive.
Also, remember that an Automatic will shift into it's final gear too if the car is driving 40+mph.
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2002 Corvette Z06 - Totaled
2003 Corvette Z06 50th Anniversary
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