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Pollyanna
#1 Posted : 03 July 2018 10:47:51(UTC)
Pollyanna

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I have as my daily car a Nissan 2L automatic with Cruise Control. As I was in Cruise Control recently for quite a lot of miles, this crossed my mind. Is the fuel economy better in cruise control at a given speed, than without it on?  Anyone know for certain?

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Mad Malc
#2 Posted : 03 July 2018 12:21:13(UTC)
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My view is, that at a fixed speed on a fixed gradient the cruise will be hard to beat-----------------------but in the real world cruise will hold the speed up hills right to the crest and you will over speed on the other side, whereas we would tend to slow a little on the uphill and lift early as we crest the hill and then let gravity take us back up to our chosen speed. Some more sophisticated systems will even apply the brakes on downhill sections and so waste the fuel you used to crest the hill which we would not do..

I understand that some HGVs have satnav and cruise integrated and take into account gradient and 'cresting'.

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Enjay
#3 Posted : 03 July 2018 13:50:17(UTC)
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Based on my own experience monitoring this (albeit not that thoroughly) across three different cars with cruise and a mpg readout, if I am trying to get good mpg, I can beat the cruise in real-life situations every time and by quite some margin.

I've just been using my MX5 to commute recently, so I decided to see what kind of mpg I can get. It's sitting at an average of 50.3 mpg for the last 3 weeks or so of motoring (28 miles each way with a little town driving but mostly on a rural A class road (A96)). I can't really use cruise much on that trip though, so I don't have any figures for that but when I have been able to compare it, driving to intentionally get good mpg figures can easily beat cruise. It's quite boring driving though.
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watchnut
#4 Posted : 29 July 2018 10:08:18(UTC)
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when ever I get to drive a car with C/C in it I often set the C/C to see what mpg it can achieve on a top gear motorway run, over 10 miles then with me "feathering" the gas pedal to see what I can do in comparison. I know it is not an exact art as the roads always undulate, but on the whole I would suggest I can do better MPG than the computer C/C , as already stated the car can not "see" traffic ahead that I can adjust for, or the up coming undulations I can allow for.

Having said that C/C is great for those long journeys, and the countless 50 MPG average speed limited roads we all endure tied in with a limiter help us keep that "envelope" dropping onto the mat!
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alanhelen
#5 Posted : 10 August 2018 14:54:49(UTC)
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Would agree with Watchnut & Enjay on this one   

sparks
#6 Posted : 10 August 2018 17:32:19(UTC)
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We have a fiesta as our second car. We are always keen to use it on long trips because with the cruise  control activated the mpg increases quite considerably. 

Also my 2.0 launch edition has an after market cruise control which, when activated, is good for saving fuel too. 

 

 

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coconino
#7 Posted : 10 August 2018 20:10:52(UTC)
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Only time I did a comparison was over twenty years ago in a Ford Maverick diesel. It consumed more fuel using the C/C for the reasons Mad Malc gives.

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