Cruise control

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Gogarty - 20 Nov 2007 22:27 GMT

I read or heard somewhere that using the cruise control is hazardous to
your fuel mileage. Is that true? If so, why? Seems to me it should
increase your fuel mileage.

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-->> T.G. Lambach <<-- - 21 Nov 2007 04:16 GMT

The more consistent the car's speed the more consistent will be it's
engine's speed and that aids fuel economy. Remember, a diesel is
basically a constant speed engine so that's where it gains efficiency.
Cruise control, if it works well, will save fuel.

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Roland Franzius - 21 Nov 2007 09:42 GMT

-->> T.G. Lambach <<-- schrieb:

> The more consistent the car's speed the more consistent will be it's
> engine's speed and that aids fuel economy. Remember, a diesel is
> basically a constant speed engine so that's where it gains efficiency.
> Cruise control, if it works well, will save fuel.

For flatlanders yes. In mountain regions its cheaper to turn off tht
control and drive at constant fuel consumption/second than speed.

The most important advantage of diesel engines especially for short ride
users is its mileage independendence of motor temperature. A Peugeot 206
2l turbo diesel takes 3-5 liter/100km independent of the engine. A cold
C240 listed with 10 liter/100 km takes cold about 16 l /100 km for the
first 6 km warming up.

Just now as a shock to the MB/BMW/Audi community the German ADAC
published the true mileage numbers with cold gas engines which are
substantially less (specific consumption higher) compared to the figures
given by the car makers themselves.

As everybody knew about for long who is used to add his figures monthly.

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Roland Franzius

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Gogarty - 21 Nov 2007 15:48 GMT

>-->> T.G. Lambach <<-- schrieb:
>> The more consistent the car's speed the more consistent will be it's
[quoted text clipped - 4 lines]
>For flatlanders yes. In mountain regions its cheaper to turn off tht
>control and drive at constant fuel consumption/second than speed.

Don't have a fuel consumption meter in my car. But I do have a
speedometer. And since my usual purpose in driving the car is to get
somewhere in a certain time frame, I would think speed is my
dominant factor. If I also get great fuel mileage, that's good.

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