The two indicators that determine when you should upshift are:
There are two indicators that determine when you need to shift into a higher gear. One indicator is the engine speed (rpm). You should read your vehicle's manual to learn its rpm range and shift up when you reach the top of that range. The other indicator is road speed (mph). You should learn which speeds each gear can accommodate, then keep an eye on the speedometer and shift up as needed.
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This questions appears in the following tests:
Colorado Practice test 13
Georgia Practice test 2
Georgia Practice test 4
Kansas Practice test 4
Montana Practice test 1
Pennsylvania Practice test 2
Pennsylvania Practice test 3
Texas Practice test 14