Mercedes c220- problems with mpg

[Nealam]

Hello I’m new here so here goes. I bought a 2012 Mercedes c220 and have always had issues with the mpg, it is always in 19-24 mpg. It is never higher than that. In a full tank il probably get 230-250 miles, any help will be appreciated thank you

 

[Gazwould]

Any black smoke or whistling indicating a boost leak ?

That's far from right .

https://www.honestjohn.co.uk/realmpg/mercedes-benz/c-class-2007

And some...

 

[Tony Dyson]

Any black smoke or whistling indicating a boost leak ?

That's far from right .

https://www.honestjohn.co.uk/realmpg/mercedes-benz/c-class-2007

And some...

That's impressive but has to be an exception to the rule, I'm a steady driver and regularly get the high 50's in mixed driving. 19-24 is poor but you already know that of course!

 

[mattkh]

Hello I’m new here so here goes. I bought a 2012 Mercedes c220 and have always had issues with the mpg, it is always in 19-24 mpg. It is never higher than that. In a full tank il probably get 230-250 miles, any help will be appreciated thank you

As engine miles tot up, the efficiency of the engine goes down.

 

[Blobcat]

As engine miles tot up, the efficiency of the engine goes down.

Shouldn‘t do if it’s serviced and maintained correctly.

 

[Nealam]

Shouldn‘t do if it’s serviced and maintained correctly.

Hi it gets serviced every year and maintained too but since day one of me getting the car 2 years ago it’s always been like this, I had the dpf cleaned out 3 weeks ago to see if tht helps but still no change

 

[Nealam]

Any black smoke or whistling indicating a boost leak ?

That's far from right .

https://www.honestjohn.co.uk/realmpg/mercedes-benz/c-class-2007

And some...

View attachment 67384

I did have a fuel leak, oil leak and coolant leak a few weeks ago which I know a previous mechanic had done on purpose while I got it serviced from him to make more money out of me- which Iv had fixed now by a different mechanic but even though that’s sorted there’s still been no change. My car even drops down to 14mpg, yours says 78mpg and honestly Iv never ever seen mine get above 20 never mind that much

 

[Nealam]

Any black smoke or whistling indicating a boost leak ?

That's far from right .

https://www.honestjohn.co.uk/realmpg/mercedes-benz/c-class-2007

And some...

View attachment 67384

There’s no smoke or anything

 

[Nealam]

That's impressive but has to be an exception to the rule, I'm a steady driver and regularly get the high 50's in mixed driving. 19-24 is poor but you already know that of course!

Yh it is very poor and unfortunately very costly on diesel too

 

[Tony Dyson]

Have you ever had the vehicle diagnosed with either your own scanner or at a dealership or independent MB specialist, are you a capable DIY'er or not?

 

[Nealam]

I havnt had it diagnosed by a Mercedes specialist but I have by 3 different garages n thyv said it’s the dpf that’s clogging up which I had gotten cleaned out a few weeks ago and now I’m not even sure if the mechanic did clean it out

 

[Tony Dyson]

You should post your location so the forum can recommend independent MB specialists local to you who will have the correct diagnostic equipment and expertise to be able to help you directly, how long have you had the car, are you still in a position to talk to the seller?

 

[steveq]

Is the temperature gauge going up to the correct level?
It should be up at somewhere between 80 and 100 on the gauge.

 

[steveq]

By the way and to rub salt into the wound, I have found that the on board computer is about 10% - 20% optimistic in its readings when compared to fill-to-fill calculations.
So, 19 to 24 might actually be 16 to 20mpg !!!?

 

[Dean Fletcher]

As engine miles tot up, the efficiency of the engine goes down.

My E250 got 139k on the clock and still smashes 50+ mpg. She does get serviced every year and over the last 2 years it only 4k miles apart. This year might be 1k then another service

 

[Nealam]

You should post your location so the forum can recommend independent MB specialists local to you who will have the correct diagnostic equipment and expertise to be able to help you directly, how long have you had the car, are you still in a position to talk to the seller?

I live in Newcastle and had the car for 2 years now

 

[Nealam]

By the way and to rub salt into the wound, I have found that the on board computer is about 10% - 20% optimistic in its readings when compared to fill-to-fill calculations.
So, 19 to 24 might actually be 16 to 20mpg !!!?

Yh you could be right

 

[Nealam]

My E250 got 139k on the clock and still smashes 50+ mpg. She does get serviced every year and over the last 2 years it only 4k miles apart. This year might be 1k then another service

Mine is very bad but I don’t know why, I thought Mercedes were supposed to be good

 

[Gazwould]

It's running wrong and will for the above reasons , filling the dpf up which then further reduces the mpg .

 

[Gazwould]

I did have a fuel leak, oil leak and coolant leak a few weeks ago which I know a previous mechanic had done on purpose while I got it serviced from him to make more money out of me- which Iv had fixed now by a different mechanic but even though that’s sorted there’s still been no change. My car even drops down to 14mpg, yours says 78mpg and honestly Iv never ever seen mine get above 20 never mind that much

It's not my C220 CDI reading but here's my C250 CDI .









Below 40mpg is just a bad day .