If you want not thirsty then you want diesel. You will not get a good diesel in those marques without potential costly issues unless lucky/know what you are doing.
For value for money a petrol Mercedes C class or Lexus IS are possibles - no-one wants them due to fuel cosnumption. But if you average 30mpg you will be very lucky.
And you need to think insurance and maintenance costs.
Basically your question has no answer as luxury cars specs don't = cheap running costs.
As for a Mercedes 124, they rust and when they go wrong £££££s and the youngest is 20 year old. My BIL has one and repair bills on suspension and exhaust are NOT cheap..And brake lines etc are now rusting.
A Honda Accord with low miles is cheap to buy and reliable. tinyurl.com/qxh5tro
Or a Toyota Avensis..
Edited by madf on 23/05/2013 at 11:33
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