If gas mileage and insurance costs are factors when you purchase a car, a 140 coupe is probably the wrong car.

Its a top of the line car from a top of the line manufacturer. Nothing is going to be cheap. To expect a lot for a little is setting yourself up for dissapointment with these cars, in my experiences.

E420 is more reasonable in most respects. So some research on the site.

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'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E