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6500 miles (10500km) on my C2S Cab and I've had as high 28mpg, and as low as 21mpg, but average ~26mpg...
Of course that's using British gallons, not US.
At about 6700 miles, I get an average 0f 20.5. That is mostly around town with short trips (under 5 miles). when I am on the highway I have seen as much as 26.4, average speed 80 MPH.