This is interesting/amusing. It's been over 3-1/2 years since I started this thread, car has been driven an additional 27,000 miles. And, with my recent head gasket repair, cost per mile is EXACTLY the same as it was in the first post: 19.7 cents!

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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife