W207 Fuel economy not as expected

[malcolm E53 AMG]

Not the easiest to do I’d take in to your local Independent the stat is about £150ish but don’t be tempted to buy other than OEM it is critical to the engine running as it should

 

[Mr_Mocata]

Great advice. Much appreciated.

 

[JBell]

According to his profile, it’s diesel.

I took it as petrol as the OP said 3.5l V6

 

[JBell]

I have a C350CDi which is the same car underneath, I get 30 round town and 40+ on a run, my tyre pressures are 36 all round on 18" wheels

 

[McDonald]

The preoccupation with MPG seems irrelevant as we can't travel far now. If we do, the roads are less congested and fuel is crashing in price. We may have to find other diversions for a while.

 

[400ixl]

When I ran an A207 350 CDI for a while it would get mid 40's on a motorway run and low 30's around town at best. It was combined averaging 35mpg.

That combined was around 50/50 across town and open road.

For the same journeys my A207 250 CDI does high 40's to low 50's on a motorway, mid to high 30's in town and combined averages 43mpg.

One of the reasons I bout the 250.