Cruise control

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Cruise control

Post by ard126k » Mon May 21, 2018 9:04 pm

Been given a loan of a car with cruise control. My question is whether CC is likely to be more economocal on a long motorway drive than my Scimitar-trained right foot on the throttle?
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Cruise control

Post by scimjim » Mon May 21, 2018 9:06 pm

Possibly not but I doubt there’s much in it - I use mine all the time.


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Cruise control

Post by philhoward » Mon May 21, 2018 9:17 pm

Depends on the terrain - on flat roads there’s only a small penalty with CC. Add in hills and you use a lot more fuel.


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Post by AJL Electronics » Mon May 21, 2018 11:01 pm

I always found that the cruise control was the smoothest and most economical way to travel.


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Cruise control

Post by Corky » Tue May 22, 2018 2:40 am

I've always found it to be less economical, but it doesn't stop me using it on some journeys.

The problem is that it's trying to maintain the same speed all of the time, so as soon as you get to an incline it adds more throttle. If you were controlling the throttle yourself, you'd probably just take a bit of a hit on the speed until you got to the top of the incline. Also, coming downhill, some cars (such as my previous Audi and the current VW Touareg) will apply the brake to stop you going over the set speed. If I was controlling the throttle, I'd probably just lift and not add any braking. The Touareg can be set to freewheel when you lift off the throttle, which helps the MPG more that you'd think. When the cruise control is on, this function is disabled.


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Cruise control

Post by Rev Light » Tue May 22, 2018 6:01 am

On my old VW Bora 2.0L 8v, it could make the difference of 3mpg out of a possible indicated 40mph ( more likely 37). As described above, inclines were the usual issue. It's dumb and has only one option, it must maintain speed by adding more fuel. I could accept the speed drop or even drop a cog.

It could make a difference on a long run. I.e. it would be noticeable.

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Cruise control

Post by Rattling » Tue May 22, 2018 8:12 am

Fuel wise I doubt over a long motorway journey you would be able to better CC ,plus the relaxing benefit is a bonus,wish all my cars had it :D


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Post by CNHSS1 » Tue May 22, 2018 11:38 am

I'd agree with Corky, on modern clever stuff the CC is slightly less economical, but much less tiring over 200-300 motorway miles, but on an old car with 3/4spds and thirsty engine it may well be better, I don't know.


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Cruise control

Post by ScimmyMike » Tue May 22, 2018 11:30 pm

CNHSS1 wrote:
Tue May 22, 2018 11:38 am
I'd agree with Corky, on modern clever stuff the CC is slightly less economical, but much less tiring over 200-300 motorway miles, but on an old car with 3/4spds and thirsty engine it may well be better, I don't know.
Same here to the tune of 5mpg in my Audi A2 TDI when I had it, both my subsequent SAAB's V70 and Audi A4 were all very similar to the extend of I only use it on long late night drags back from Falmouth these days, too much traffic and total wallies driving during the day now


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Post by ScimiTom » Tue May 22, 2018 11:57 pm

In relation to something Corky said, I have often wondered about this... If you've got cruise control on and you go downhill, such that the brakes are activated, do your brake lights come on? I would imagine they do, but is there then some critical speed/gradient ratio at which the car 'decides' that brake lights should illuminate?


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Post by Corky » Wed May 23, 2018 12:23 am

On the Audi they definitely came on. Whilst towing at night you could see them illuminating the car on the trailer.
To be honest, that’s how I discovered that the car was braking for me whilst using cruise control.


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Cruise control

Post by Rev Light » Wed May 23, 2018 7:16 am

Like others have alluded, use of cruise control can be limited by the volume of traffic on the major routes and the likelihood of someone close by doing something stupid.

If I do the 5 hour run from Swindon to Anglesey, there are some stretches of motorway (M5/M6 past Birmingham) where it is not advisable to use it. Other stretches are hilly or down to busy 2 way traffic.

What I do use it for, is extended road works. Places where monitor speed is likely and it can save you from an embarrassing letter.

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Cruise control

Post by ard126k » Wed May 23, 2018 5:42 pm

Interesting stuff. I'll give it a try if I find a quiet bit of road, otherwise I might need it when right foot gets cramp from being too long in one position. I've been known to use the left foot on the throttle in the past!!
Alex.


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