question about fuel mileage

I am in the market for a new vehicle, looking at the yukons and was just wondering what kind of fuel mileage every one is getting! thank you for any input

2005 Yukon 5.3, 4.10 gears. Warm weather, 15 mpg town (not city)/rural driving, 14-15 mpg towing 5200 lb load highway/rural. 18.5-20 mpg highway NOT exceedeing 64 mph and mileage goes down like a rock above 65 mph. Cold weather is about 1-1½ mpg less.

I do not presently own one, but have had several Suburbans in the past with the 5.7. I usually averaged about 15 in the city and 20 if lucky on the highway.

I was talking to a guy in a parking lot this past weekend who was just getting in to his 06 or 07 Yukon. I asked him that same question and his terse reply was "16.2", not 16 or 16 1/2, but 16.2. He seemed a bit irritated that I even asked him the question.

3000 mile running average = 15.7- 16.7 with 6 kids in the car.. 80% hwy