Hi, I have a 1.9tdi 130 bhp (2002). My car shows 35mpg on the clock (as the average). Im sure my car should be giving me more mpg than this. I used to have a Golf 1.9tdi 110bhp (2002) and this used to say 46mpg. What do you guys get from your cars? Is it possible that the computer is showing as incorrect number? What do you guys get from a full tank and how much does a full tank cost? Is there anything i can do to increase my mpg (I was told to try this liquid that you can put in your fuel tank which costs 10 pound and this might make a difference). Also if i put in super diesel will this clean out my engine and make a difference? I also get black smoke out of the exhaust when i put my foot down. I have seen this on a few diesels but it does not look to good. Is there anything i can do about this and should it be doing this? Thanks.