Hello ! I only recently bought a sher well preserved Sierra 2.0 i KAT ( 2 l / 74 KW ) with OHC Motor & EFI injection. Fine car, grateful and big, but the box sucks all serious loose 15 liters / 100 km, with very good driving method !!! I have already tried this already over 3 tank fillings, am mainly on the way in the city, but extra ten kilometers overland steamed – again about 15-16 liters …… Have already replaced the anyway dirty air filter (& new candles for cleaner combustion) immediately against sport fabric filter with higher air throughput, but also brought no improvement, up to which it runs better/cleaner. What can be such a high consumption ? have already been lying under it, but is not too leaky the box either…. Can it lie on the air volume meter ? Oh so – the standing gas fluctuates with me between 200-900 U/min, but only if the car was too slow to drive, is not too bad !