I'm about to sell my 06 F150 Supercrew and buy a new Tahoe because I need more room for my girls on road trips and such. My truck gets 15mpg hwy and I know the new Tahoes with the 5.3 are supposed to get 20mpg. Does anyone actually get 20mpg or more with the 5.3? I did a search on here and looked for awhile but didn't really find what I was looking for. If I can't get better mileage then I get now I probably won't even bother. Thanks.