I've been looking at the 2010 GMC Sierra and 2010 F150. If you get the larger engine (5.3L vs. 4.8L in the GMC) or the smaller engine in the Ford (5.4L vs. 4.6L) you can get a 6 speed transmission with 2 overdrive gears. Their advertised mileage is quite reasonable for a truck.
GMC Sierra 5.3L V8 6 speed auto 315HP - 15/21 MPG city/highway (better than the 4.3L V6, 4.8L V8
Ford F150 4.6L V8 6 speed auto 292HP- 15/21 MPG city/highway
Although if I were regularly towing a boat I'd probably want the bigger motor in the Ford, it gets 14/18 MPG 320HP, and has the 6 speed auto as well.
All these numbers are theoretical, of course, but my first choice is the GMC.
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