Poor mpg?

[steve333]

Hi all, had my Cls350cdi grand edition a few months now and after doing a brim to brim on the last tank car is only averaging 30mpg(mainly short 5 mile each way daily commute in light traffic/50 mph most of way),tyres are checked/adjusted regularly,glow plugs were changed at service upon sale,I don’t drive the car like I stole it-does it sound a bit low/something a miss?

 

[Deleted member 149005]

Not if your average journey is only 5 miles...

Petrol would be better

 

[steve333]

Not if your average journey is only 5 miles...

Petrol would be better

Hi,thanks for your thoughts,I do at least one 50 mile round trip a week and one 80 mile round trip a month(mpg is around 36 then),prefer a v6 diesel over a petrol and have had them before and got better mpg so just making sure there’s no underlying problem,Steve.

 

[whitenemesis]

The mpg will always be lower in the colder months and at just a 5 mile trip I doubt the engine is getting fully warm.

 

[steve333]

The mpg will always be lower in the colder months and at just a 5 mile trip I doubt the engine is getting fully warm.

Hi,thanks for your thoughts-drove the car 18 miles earlier today,10 degrees outside temperature,car up to running temperature within 10 -15 minutes,mainly 30/40 mph roads,some traffic in final mile trip computer showed average 28.9mpg for journey.

 

[400ixl]

Sounds about right to me for the V6 diesels.