Mercedes: Benz 200, fuel tank capacity, model chassis

Question
1.What is the fuel tank capacity (in ltrs) of Benz 200 i.e 1982 -84 model?
2. Why is the axel of this model of benz always the weakest link. It often makes funny sound when its about going bad.
3. Is there anyway I can improve on the fuel consumption of this model of benz?

Answer
Answer:
#1. Exact year, model and Chassis number of your vehicle needed.
#2. Please explain this question further, I have seen these axles run 241402 kilometers.
More data needed, year, model, chassis number, total kilometers on this vehicle, general geographic location, what the vehicle is used for, how many drivers.