Looking to buy recent college graduated son a C class (automatic) - he is very concerned about fuel mileage - pretty responsible - and, he has a job already!

I am looking in the $10k range ... recommendations or comments?

Thanks!!!!

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George Stephenson
1991 350 SDL (200K and she ain't bent, yet)
former 2002 E320 4Matic Wagon - good car
former 1985 300 CD - great car
former 1981 300 TD - good car
former 1972 280 SEL - not so good car
a couple of those diesel Rabbits ...40-45 mpg