whats the most fuel efficient way to drive my mazda 5 speed?

T CUSE 2

New member
i mean like the less rpms means less gas right? now if the speed limit is 45 mph and i can easily do that in 4th gear at about 2800 to 2900 rpms or should i just shift to 5th (which i think is pretty much overdrive) and stay at about 1900 to 2000 rpms? would i save on gas in 5th gear and when is the best time to shift?

another question? now instead of using my breaks i can downshift but does that waste gas because everytime i down shift the engine revs up?

please peopel that actually know what they are talking about answer

thanks
 
your owners manual should tell you what a safe minimum rpm level is. and as for compression breaking(downshifting to slow down) it is not so good for the engine or transmission. just use your breaks...they are much cheaper to replace than your engine/transmission.
 
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