Get a 2015 GLK350. I put the lovely Ms engatwork in one a few years ago (had 80k miles on it when we purchased it) and she just turned over 227,000 miles. She averages 10,000 miles/3 months mostly interstate travel. Averages a good 24 mpg. Nothing but plugs, air/cabin filters, brake fluid changes, rear diff fluid changes, oil/filter change, tranny service and tires needed to date. I did go ahead and change out the crank position sensor as a preventive measure.

I've only had one of the turbo fours in the shop and can't speak for the reliability of it but I would think with proper maintenance it should go for awhile.

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Jim