[Big Dave]

Not only is the Tahoe about as sleek as a box of Wheaties, but that automatic and that half-ton of four wheel drive machinery you tote around not doing you any favors.

But people didn't lay out the big bucks for SUVs without a reason. They do a lot of things well. Because there are so many of these monsters and because people (especially women) like them, if one can get a 25% improvement that is a huge improvement in national gasoline consumption.

I think with the right mods (which would also open new vistas of hypermiling), you could squeeze 23-25 MPG out of it, and retain most of the functionality.

I get 27 MPG out of a bigger vehicle and run the AC anytime I get hot - for a porker like me thats April through mid-October here on the scorched steppes of central Indiana.