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Old 07-12-2016, 09:43 PM   #16
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Hi there, awesome a fellow 209 owner. With mine when the check engine light came on it was barely even making 80 and then falling again. Today it was clearly over 80.

My fuel economy on my run to work is generally late 20's, best I've ever seen is about 34 which was on a long motorway run of a few hundred miles.

The low coolant temp has an adverse effect on the fuel economy because the car thinks the engine is cold and never really gets up to temperature so runs it rich as per the warming up routine, therefore using more fuel....or at least that's my understanding of it.

I'd like to think a 1.8 could get more than 27 but maybe I'm living in a dream world.
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Old 07-12-2016, 10:34 PM   #17
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Originally Posted by Hamble Flyer View Post
This thread has prompted me look at the coolant temp in my 209 albeit with a 1.8 M271 engine. During a 30 min run in town today it only just crept above 80 and mpg was around 27. I have had the CLK for only 3 weeks or so and the 90 % urban driving of a couple of hundred miles shows about 28 mpg average.
Is this mpg about right for the car?
I'm off on a longer fastish A road trip tomorrow so will get a better picture of fuel consumption.
Can anyone provide a quick explaination why lower coolant temp has an adverse effect upon fuel economy......just curious.
I have a 2003 209 1.8litre 200k. In normal mixed use it returns around 32-33mpg, 37ish on a steady run. The best I saw was 42 mpg on a long 1000 mile run to Italy. All according to the computer thing.
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Old 07-12-2016, 10:43 PM   #18
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Originally Posted by richardgr88 View Post
Hi there, awesome a fellow 209 owner. With mine when the check engine light came on it was barely even making 80 and then falling again. Today it was clearly over 80.

My fuel economy on my run to work is generally late 20's, best I've ever seen is about 34 which was on a long motorway run of a few hundred miles.

The low coolant temp has an adverse effect on the fuel economy because the car thinks the engine is cold and never really gets up to temperature so runs it rich as per the warming up routine, therefore using more fuel....or at least that's my understanding of it.

I'd like to think a 1.8 could get more than 27 but maybe I'm living in a dream world.
Low 20's around town, low 30's on a run is what I am getting from my Clk280
The 1.8s are quite a bit better (on fuel)

I haven't had a thermostat issue (yet......)
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Old 07-12-2016, 11:16 PM   #19
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Quote:
Originally Posted by richardgr88
Hi there, awesome a fellow 209 owner. With mine when the check engine light came on it was barely even making 80 and then falling again. Today it was clearly over 80. My fuel economy on my run to work is generally late 20's, best I've ever seen is about 34 which was on a long motorway run of a few hundred miles. The low coolant temp has an adverse effect on the fuel economy because the car thinks the engine is cold and never really gets up to temperature so runs it rich as per the warming up routine, therefore using more fuel....or at least that's my understanding of it. I'd like to think a 1.8 could get more than 27 but maybe I'm living in a dream world.
The 1.8 has no problem getting more than 27 and is a great long distance cruiser.


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Old 08-12-2016, 12:16 AM   #20
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The 1.8 has no problem getting more than 27 and is a great long distance cruiser.
why have you set to C??
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Old 08-12-2016, 07:14 AM   #21
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Just because it is a smoother change.
And tbh, I never really use 'M'.
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Old 08-12-2016, 08:14 PM   #22
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Today in my 209 1.8 I did a 137 mile run of which 60 miles was on a motorway at 70 mph and the remainder on mix of 50 mph + rural A Roads and some town stop start stuff.
Returned home with a figure of 37.4 mpg. Very pleased with that!
Coolant temp steady at approx 82.
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Old 08-12-2016, 11:10 PM   #23
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My coolant temp is around the 80c. The CLS 90c.

I guess there's lots of factors to consider ambient temp, distance.. saying that the CLS warmed up quicker than the CLK does? Both M272 engines both FMBSH fwiw. Notably better fuel economy in the CLK with a slightly less displacement of 2996cc vs 3498cc same sort of driving style and similar performance.. i guess the weight hindered the CLS.

CLK still going holding off till my second son arrives mid March. Probably a better time to sell to.

The 218 shooting break is calling.
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