What kind of gas mileage are you getting (300E)?
My 1991 300E is getting about 11mpg in city driving. After reading some posts on this topic, it sounds like it could be O2 sensor, plugs, wires, or maybe even something else. Anyway, my mechanic is checking it out tomorrow - I'll post his findings.
Also, what kind of mileage are you getting with your 300E's? What should I expect to get once things get sorted out?
2001 Porsche Boxster
1991 Mercedes 300e
1971 BMW 2002
2000 Mercedes ML320 (wife's!)