New E220 CDI Coupe Poor MPG?

[HumberMart]

There's no need for speculation or opinion on this.

Cruise Control does use more fuel, end of.

It's pure physics.

On anything other than a purely flat road, cruise will use more. Especially the more advanced versions that apply the brakes, as in Mercs.

 

[gIzzE]

gizze and rfo65, Ill have to politely disagree with you based on my experience.

Of course it will use more, think about it properly, you can't take advantage of downhill and picking up speed, and where as we can let off the gas and reduce speed slightly on climbs the cruise will go for it to keep you at your set speed.

 

[geraldrobins]

Thanks for a considered reply gizze.
I usually flick off cc on downhills anyway. Ill apree that by varying your speed you can drive more economically, but if you drive at say a constant 70 I cant see there is much in it.

 

[gIzzE]

Thanks for a considered reply gizze.
I usually flick off cc on downhills anyway. Ill apree that by varying your speed you can drive more economically, but if you drive at say a constant 70 I cant see there is much in it.

Trust me, I used to do an hour commute and tried it on and off on numerous times and with it on it made a huge difference, and that is in Norfolk which is really flat.

 

[rothbury]

Trust me, I used to do an hour commute and tried it on and off on numerous times and with it on it made a huge difference, and that is in Norfolk which is really flat.

It's cack-handed that's why. If you ever come out of it and slow down and then put it on again it really accelerates hard up to the set speed again. Not subtle at all and I have to say I rarely use it. Can't understand why people think it's more economical than one's own right foot as it isn't.

 

[gIzzE]

Exactly, it doesn't think about economy, all it thinks about is maintaining speed regardless.

 

[ItalianTuneUp]

Sounds like an interesting research area for the s class engineers to chew on.

Imagine: GPS gives location and software knows road being travelled on and the direction taken. Topographical map data gives elevation ahead, so software knows a hill is approaching. It also knows current speed, so it can predict final speed that will result if gas maintained, and knows speed limit that must not be exceeded...you see what I mean?

Of course, there are complications. Nothing unsolvable though. Just firing up the editor and compiler... ;-)

 

[rf065]

Imagine: GPS gives location and software knows road being travelled on and the direction taken. Topographical map data gives elevation ahead, so software knows a hill is approaching. It also knows current speed, so it can predict final speed that will result if gas maintained, and knows speed limit that must not be exceeded...you see what I mean?

I see where you are going with this, design a machine that will think like the human brain and the results will be better!

Russ

 

[ivandraganov]

Sounds like an interesting research area for the s class engineers to chew on. Imagine: GPS gives location and software knows road being travelled on and the direction taken. Topographical map data gives elevation ahead, so software knows a hill is approaching. It also knows current speed, so it can predict final speed that will result if gas maintained, and knows speed limit that must not be exceeded...you see what I mean? Of course, there are complications. Nothing unsolvable though. Just firing up the editor and compiler... ;-)

I don't want it....

 

[ItalianTuneUp]

I see where you are going with this, design a machine that will think like the human brain and the results will be better!

Russ

Yes, it's really just bringing CC into the 21st century using technology that's already available. It might have unintended consequences though: variation in speed compared to the vanilla CCers.

 

[Brummie1372]

Sounds like an interesting research area for the s class engineers to chew on.

Imagine: GPS gives location and software knows road being travelled on and the direction taken. Topographical map data gives elevation ahead, so software knows a hill is approaching. It also knows current speed, so it can predict final speed that will result if gas maintained, and knows speed limit that must not be exceeded...you see what I mean?

Of course, there are complications. Nothing unsolvable though. Just firing up the editor and compiler... ;-)

I can see one biiiiiiiiiiiig problem with that. Mercedes satnav, its about as much use as a handbrake on a canoe


Brummie

 

[dubsR33]

when you got the software update how much did mercedes charge for it?

i was wondering if i went to them in my clk 320 cdi they could maybe do something similar etc

 

[ede220coupe]

It was done under warranty as part of the check to see if there was any reason for the low mpg, so at no cost.

 

[ItalianTuneUp]

I can see one biiiiiiiiiiiig problem with that. Mercedes satnav, its about as much use as a handbrake on a canoe

Brummie

True, from the few times I used it, it seemed like a right royal pita