A 170 CDI low MPG

[kliton]

Hi EVB,

Am new to the forum so greetings to everyone and happy new year.
I own a C 220 CDI 2001 and a A 170 CDI 1999.

On the A Class my mate is experiencing a very low mpg ratio, lets say about 23 imperial mpg. What would help me a lot is list of the possible causes of this. The car has nearly 100k miles on the clock.

BR

 

[mattkh]

..... What would help me a lot is list of the possible causes of this. The car has nearly 100k miles on the clock.BR

Hi
An automatic and not manual
Air flow sensor faulty
Diesel leaking past the seals

 

[bigtwin]

Any reduction in power?