do all 2000 gmc yukon denali have all wheel drive on 2000 GMC Yukon Denali

worried about ffuel mileage

Asked by for the 2000 GMC Yukon Denali
from what all data says yes. i have a friend w/ one and they say they are terrible on gas. like 12 miles per gallon.a tahoe gets like 17mpg. the yukon has the bigger motor and uses more gas