I was expecting better. Not millions but just better than this! 1990 Mercedes 208D 2.3l - 21.8 MPG for the last few tanks. I have been trying to drive sensibly! Not going over 60mph. OK, lots of hills in Devon and Cornwall need 3rd or even 2nd gear at times...... but seriously! Under 22 MPG? Am I expecting too much, or does this sound a little low to you? BTW - I tried the premium fuel. Made no difference. Felt like a I had a bit more power, but the exact same MPG I got with standard diesel. ETA: There is an after market turbo and inter cooler in it - could that be the culprit?