mk3 tdi golf 1997 ahu. i seem to be getting very poor fuel economy from my golf, last calculation of 35ish mpg (petrol car figures). recent all filters service, recent headgasket and timing belt (checked and timed proffesionally) no black smoke on acceleration and does not get raced or thrashed all the time, (in comparison my old audi 80 1993 1z tdi i used to get 55ish mpg with the same driving style) any suggestions as to why this is so poor would be greatly recieved. this car is my first golf so im learning all the time, many thanks