I have found the 201's extremely reliable and economical. The 2.2's consistently return 40+ mpg, the 2.5 mid to high 30's. My mileage is 98% flatland highway driving at 63+/- mph. I generally will only hit 2-3 stop signs in a hundred miles and I am easy on the takeoff. Mileage suffers with a 50/50 mix of #1 & #2 fuel in the winter. PowerService adds 3-4 mpg in any weather. Red juice further improves mileage 2-4 mpg (not that I would use it), veg reduced the mileage on the 2.2 to high thirties.

Jim

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2005 C240 4matic wagon (daily driver)
87 190D - 225K (on loan)
85 190D - 312K (on loan)
2011 Subaru Legacy AWD (Wife's)