My car likes to idle rough from time to time. I know that diesels are traditionally rougher engines that knock a lot harder than gasoline models. Would new engine mounts fix this rough idle? Mercedes has looked the engine over, it hasn't had any major engine service since 90k it's now at 140k and they said the engine is in perfect running condition. Which leads me to my next question. What is the normal mpg with these cars? I get around 30mpg in the city, it depends if I have lead foot syndrome or not for it to be higher or lower. Is this about what it should be? I love this car so much, even though it is a slow poke, it's a beautiful car! Thanks.

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1984 190D 2.2 Auto 220k
2001 Jeep Cherokee Sport 70K
2004 Lexus RX-330 ??K
2005 Chrylser Crossfire LTD 6K

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