Good to see you have several opinions to consider.

My opinion is that its a no-brainer to take the 60 cents a mile and drive the MB for all its worth. I presume you don't have to haul anything that would wear or damage the car.

The mileage you put on the car in a highway situation is the easiest mileage you can get - you won't wear the car all that much as long as you keep up with the maintenance.

I have done this previously with with a newer vehicle (small pickup truck). That truck now has 350k+ miles on it, never had engine work, and still runs fine. Plus I have extracted a significant portion of the money I paid for it with the mileage reimbursement.

I wish I could be in your situation with one of my old Mercedes diesels.

Extract all the money you can and enjoy driving at the same time.

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles