Just a quick reply on the mileage. I have an 85 500SEL that consistently gets between 19 and 21mpg on the highway with Regular unleaded and averaging over 75mpg. I've gotten as high as 21.68 mpg on a 300 mile leg of a road trip. I just keep the tires filled up to recommended pressure and the air conditioning does not currently work on mine. Not bad for a 23 year old car.

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'85 500SEL 173k "Benny" Slowly rusting out in MN. (sold to my brother in WI)

'01 E320 Wagon 4matic 89k

'87 volvo 240 DL Wagon 146k + x miles current on blocks

'80 Kawasaki KZ750 LTD 11500 miles --the daily driver--