Real world MPG - 350 CGI vs 500 vs E63

SW18

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Fudger

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Real world E63 motorway mileage MPG

This is from Sunday when I took a trip from Woking to Nantwich and back.

M25/M40/M42/M6.

Over the last 5k miles, I am at 21mpg but that includes quite a bit of town driving and stop start commuting.
 

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cezar

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Guys I know it’s old but need a piece of advice. Very curious about the fuel economy on a W212 350 CGI MY2009. I see numbers everywhere that are far from what I’m getting. I totally understand it depends on lots of factors but my cars shows for the last 4000 km (roughly 2500 miles) an average of 11.9 l/100km ( roughly 20 MPG). And that’s with 50% of on highways, 40% on busy A/B roads and 10% city. As for the driving style was as per the roads and no trying to save fuel. Anyway it looks to high if I read your numbers around here.

Another thing, don’t know if relevant, while driving around 50 km/h just I just reset the trip and let the car go with no press on the pedal. It starts at 9.4 l/100 km (roughly 25 MPG) when it should be the minimum ever.

I know this is not a car to save fuel but just curious and wanna make sure all’s ok.

P. S. Running on 18 inch wheels if that makes a difference.
 

gIzzE

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First, it is getting to 90ºc on the thermostat and staying there no matter what you do, ie hills, traffic etc.?
 

SW18

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I’ve just been in the EU in mine and switched the instrument display to metric, and it showed my long-term economy of 26.5mpg as 10.6l/100km. So only 10% different from what you are getting. I do most of my mileage on highways and quiet A or B roads. So you’re probably doing ok.

If I reset the trip at the start of a long motorway journey and leave it, by the end of the trip I’m usually below 10l/100km and very occasionally below 9l/100km if it’s a long trip (over 300 or 400km) and the traffic has been light.

Be aware that hills make a big difference and we don’t have many of them on our UK motorways.
 

cezar

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First, it is getting to 90ºc on the thermostat and staying there no matter what you do, ie hills, traffic etc.?

I’d say yes but have to admit never checked it constantly (will try to have a look from now on)

I’ve just been in the EU in mine and switched the instrument display to metric, and it showed my long-term economy of 26.5mpg as 10.6l/100km. So only 10% different from what you are getting. I do most of my mileage on highways and quiet A or B roads. So you’re probably doing ok.

If I reset the trip at the start of a long motorway journey and leave it, by the end of the trip I’m usually below 10l/100km and very occasionally below 9l/100km if it’s a long trip (over 300 or 400km) and the traffic has been light.

Be aware that hills make a big difference and we don’t have many of them on our UK motorways.

for me there’s quite hilly roads (A/B). Not high but plenty of ups and downs.

today on a 360 km from plane reaction to hilly side (40 km on highway, 100 km on B roads and the rest A roads but mostly small cities in and out and lots of overtaking) I made around 12 l/100km. The idea is that I’ve never seen those small number you guys are throwing here. If I mind my foot I could go as close to 10’ish l/100km.

for example this is a short trip in normal big city traffic.
 

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cezar

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I’ve just been in the EU in mine and switched the instrument display to metric, and it showed my long-term economy of 26.5mpg as 10.6l/100km.

That’s strange. Maybe it has to do with conversion formula! Are there more mpg numbers?
 

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SW18

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for example this is a short trip in normal big city traffic.

Yes that would be about normal for me too, I get about 15l/100km in city traffic.

That’s strange. Maybe it has to do with conversion formula! Are there more mpg numbers?

Yes! A UK gallon is 20% bigger than a US one. I think this is why you’re seeing a difference to the figures on here!
US gallon = 3.79 litres
UK gallon = 4.54 litres
 
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cezar

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:wallbash: 4972C0AF-0951-4F5E-BEBB-4815813AD32B.jpeg

Should’ve done my research :eek:
But at least I learned something new. I thought it’s enough to have miles, which them are several already; never thought of “more” gallons :wallbash:
 

cezar

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But this numbers are still far for real world (like any car maker “best” numbers I think)

527A7F85-AA54-4D12-907D-BCBFBC5A0869.jpeg
 

gIzzE

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I used to use 9 L/100km from my E350 3.5 petrol as an average.

8 L/100km on a run.

The 10km cold start we used to do every day for the school run I used to get 10 L/100km, which was better than the E350cdi it replace, which would get around 11L/100km.

If you do lots of sub 20km journeys the diesels average is ruined as they take around 20km to get up to temperature, until that point they are seriously over fuelling.

Remember that 6.6 L/100km official figure is from a car up to temperature already, getting up to 70kmh and then slowing to around 50kmh over 10km to average 50kmh.

So get your car up to temperature, set tyre pressures to around 2.4bar front and 2.6 rear and then cruise at 50kmh and reset your OBC and see what you get after 10km.
 
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cezar

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i know it's been a long time but here's the feedback. in the end it can go very low in terms of consumption, not that this is what this engine is for though

got a 6.8l/100km over less than 10km. kind of flat road.

other than that it stays roughly around 10-11'ish driving as you need

IMG_6432.jpeg
 

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