Hello!
Recently purchased a 1989 300se (167K) and have noticed that that mpg has sank from 20 to around 14. We adjusted the mixture screw a little (not much) to run a little richer. Car starts normal, however from a dead stop the car chokes a little when I open the throttle. Also, the "economy" gauge needle sits about 1/3 of the way from the left when at idle. Idle rpm is normal, we checked.

Question: Is this normal? This is my first Benz and I don't really know how to judge performance and economy. Any help is appreciated!