The last tank was 430.1miles to 67L - giving 24.3mpg US
This tank included a lot of town driving and a fair amount of cold starts (down to -6 Celsius).
It's not the worst, but definitely could be improved upon.
Being a heavy car with a tired autobox and low power, it feels like you are always accelerating - something I need to try and avoid.
With it being mechanical pump, I don't even get DFCO
Initial thoughts are:
Remove the extraneous junk/tools from the boot
Add a little more air to the tyres.
Work out the shift patterns of the gear box more effectively.
Longer term:
Autobox fluid and filter change
Diff oil service
Replace exhaust
Advance fuel pump timing (it alters as the chain wears, MB suggest 1-2 degrees for every 100k miles)