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For what it's worth:

Silverado 2004 long bed 4-speed auto tranny, 4.8L, 4x4, stock, 3,000 miles on it....

Springfield Missouri to Omaha Nebraska, pretty darn flat... no mountains, anyway. Quite a bit of 65 and 70 mph driving. Drove through towns for around 20 miles of the trip. A small amount of stop and go in the cities.

20.5 mpg. Figures are accurate. Did not drive in an attempt to increase mileage. Wind not a factor.

That's not shabby for a full-size pick-em-up truck.
 
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