S203 C220 CDI Economy

[lancebond]

i've been getting around 43-45 mpg on a tank, and all of a sudden i'm now getting around 37!

i always thought the 45 was a bit low (i took into account the fact it's an auto, but even so with my previous w203 manual i was getting close to 60mpg) but now i'm worried that i can't crack 38...


it's a little overdue for it's B service, is there anything else i should be looking for other than the filters that are due to be checked/replaced

 

[SteveFromAvantgarde]

I would say a good service may sort it out.

Also what is you engine temperature doing? Make sure its running around 80-90 degrees and not taking an age to get there, a jammed thermostat can cause poor economy.

 

[recardo]

MAF could be another cause. Not sure if there is a defined test to confirm it though.

 

[lancebond]

i'm going to give it a good service. the maf seems fine.

so i need

air filter
fuel filter
oil filter

oil (mobil 1 i know, but what oil exactly do i need?)


am i missing anything that needs to be changed?

 

[recardo]

have you done the service? any improvement?

 

[lancebond]

have you done the service? any improvement?

Changed the air filter and was an improvement, just waiting on some decent weather to change the oil and fuel filters