My 5.3 2wd 1/2 ton Silverado gets 19 MPG highway. 25% for $10k doesn't sound like a bargain to me. Maybe if you put 300k on it you would break even. Almost as silly as a hybrid version of the Lexus LS. 
Many of the larger V6 SUVs on the market can pull 6-7000 lbs, with nearly the interior volume of a Tahoe, and 24 MPG or so. You pay a real MPG premium for a body-on-frame SUV like a Tahoe, but few really take advantage of that extra capability. When you consider how good many of the larger unibody SUVs have gotten, it really doesn't add up. Not to mention the fact that the unibody SUVs are far more pleasant to drive on-road.
Either that, or wait a few years until F150s and Silverados have small displacement turbo diesels. Considering that a diesel F350 dually 4wd can pull in 20 MPG, 25 MPG should be a breeze in an F150.
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‘07 Mazda RX8
Past: 911T, 911SC, Carrera, 951s, 955, 996s, 987s, 986s, 997s, BMW 5x, C36, C63, XJR, S8, Maserati Coupe, GT500, etc
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