My gut feeling is that it is better to drive used cars than ask the industry to construct another car for you. People complained about Edward Abbey driving an old 70's Cadillac. I think he's as good as the Prius owner. On the other hand, used cars would not be available if someone else was not buying a new one.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13