Here in SC, diesel is about $3.60 to $3.79. I think it was $3.65 at Krogers less any discount accumulated. Our GLK is very new - only 4 fill ups so far. Mileage not as good as advertised. About 32mpg for mostly highway. Driving at under 70mph helps a lot, but with 70mph speed limit we tend to faster than that.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5