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What I have seen when test driving trucks recently...and keep in mind that these were all short drives, but indicative of "possible" fuel mileage...on several 450's, all driven at 60mph cruise control for several miles on relatively level terrain:
all trucks 4x4, automatic except for one manual tranny
brand new 4.88: 12.9mpg
10k mile 4.30: 8.9mpg (I think something was wrong with this truck)
9k mile manual 4.88: 14.1mpg (not very level terrain, ups and downs)
11k mile 4.88: 12.9mpg
30k mile 4.30: 16.7mpg
brand new 4.30: 13.4mpg
And yes, before you ask, all fuel avg gauges were reset at the start of the test!
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