The w210 with the 3.2 V6 and the 5-speed (after 1998) is the best combo of mpg, longevity, and bang-for-buck in the mid-size cars. You can go smaller to the C-class, but I think the mpg gains will be minimal.

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- Brian


1989 500SEL Euro
1966 250SE Cabriolet
1958 BMW Isetta 600