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Try 62 MPH instead of 72 without the A/C and you should see a HUGE improvement.

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It's a truck.....anything over about 65 MPH (105kph up here) is going to kill mileage. Even my 92 Cummins diesel looses about 4 MPG if I drive it at 65 MPH instead 0f 60MPH. I wouldn't turn off the A/C as such, but if you slow that puppy down to under 65, I bet you'll get at least 17. Everyone in my family has a truck...different years and different engines, and they all react the same to the difference in speed.

Also....16MPG down there is like 19 MPG up here in Canada.....I'd say not too shabby for a pickup even at that.