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Is it a good idea to shift the gear all the time in N?


vasco

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One point of view is that Shifting in and out to Neutral at every juncture shocks not only the transmission, but the u-joints in your driveshaft, or your CV joints, and differentials, and other important bits. From a purely technical standpoint, if you've got it in gear and coasting, the engine is running at a higher rate than if you'd had it in neutral. However, whether this means more gas consumption or not is, mostly, moot - two of the inputs that determine fuel delivery are engine speed and vaccum, and those at such low levels, likely balance each other out. At Neutral is a different story. The vehicle is not spinning the engine; there's no vacuum increase. In neutral, the engine can produce only so much work as is required to keep itself running. In drive, the engine also needs to spin the torque converter and the transmission pump. *slightly* more work=slightly more fuel use. Another advantage of putting it in neutral at (especially long) stop lights is that you don't have to put your brakes on as hard. This in theory leads to less heat warpage.

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