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"Shift Up light" wastes gas?
Posted by russdog (more from russdog) on Tue, 17 Jul 2001 09:50:33
In Reply to: "Shift Up light" for CH Tay, Bill D, Tue, 17 Jul 2001 08:25:43
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>Typically it shows at about 2000 rpm and too often puts you too
>low in engine rev's (so you push the accelerator and waste more gas).
There are two points here that are not true:
1. The light does not come on as a function of rpm. Rather the light comes on as some function of rpm *and* throttle. That is, if you are moving along gently, it will come on sooner. If you are acccelerating, it will not come on until you have many more rpm.
2. The effect is not to waste more gas. Studies some years ago by BMW demonstrated results that, while couter-intuitive, were empirically strong: best fuel economy is obtained by rapid acceleration up to a low shift point. This goes against one's gut expectation. Evidently it does save gas to shift early, and it does save gas to rapidly accelerated up to that low shift point.
Judging from the behavior of the shift-up light, the proper shift point does rise in rpm as the rate of acceleration rises, but it is still lower than one might think.
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