I've never gotten 12 mpg on that car . . .maybe high 20s in mpg, but not 12 mpg, so I didn't even pay attn to that silly chart.

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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002