I say that about the two because I know highway, from the old MPG notes I have, the explorer was running about 17-19 best, the Tahoe has gotten an average of 20 (only 4 data points, so its not a TERRIBLE sample just not a great one) the last few trips home and back.
I'm typically seeing the city miles mainly (best around 15 but the low has been 11), I drive from my apartment to campus everyday and back, I'm on the "highway" for 5 minutes either way and I usually hit all 4 nice and long stop lights on it, so I still consider that close to city driving. Next trip home I will record both my mileage home and back, and whatever driving I do in between. To be honest, I was pretty shocked when I saw the 20 the first time though.
If I get 22 in a vehicle that weighs nearly 3 tons (including my big butt) I'll be pretty pleased, and Iwill let you know regardless.
@Gorilla, it's not so much a pissing contest, I think with a full tank on our trucks running north of $100 we all want to do the best we can. Personally though, I'm 6'5" and 290, this is the most comfortable vehicle I've ever driven and can't imagine driving something smaller. To me comfort/not feeling cramped > gas mileage.