Mid-size or full-size? Towing? more info of your needs...
Toyota 4 runner buy with about 60000 on change all the fluids filter and plugs. These run for 250000 mi. With very little repair. This SUV is a frame truck
Don't want to argue with you Dave B but your wrong. I have a 2008 GMC suburban Denali with 20" tires with 5.3 engine . Got 20 mpg and 20.4 mpg last week on two different fills using miles to gallons from the pump. Checked it every fill from NE IA to Mesa AZ putting 3600 miles on it round trip. Our low was 17.3 mpg and ran 5-6 mph over speed limit. That included cargo on the roof and cargo on the hitch and back end loaded up to the gills. Also 5 kids and 2 crazy parents for taking everyone in the suburban rather then flying. Saved $3400 verses flying 7 people roundtrip. Make sure to get one with dvd if you have kids. Amazing how quiet they get when watching a good movie. We do only get 12-14 mpg running to town back and forth. Had 3 suburbans now and wife refuses to get anything else for her car. They do take extra gas compared to a car but at least I know my family is safer.
Please correct me if I'm wrong but, doesn't the Denali come with the 6.0? Totally different set up. Don't want to question you but I've owned 4 Suburbans and never got better than 16 - 17 mpg with the 350 or 327 motor. Highway or city.
Powertrains and Performance
GMC offers four V8s on the Yukon XL. Standard on the Yukon XL 1500 (half-ton) is a 5.3-liter V8 that makes 320 horsepower and 340 pound-feet of torque. Equipped with GM's cylinder-deactivation technology, this V8 provides better than normal fuel efficiency with a 14 mpg city/19 mpg highway rating for 2008. A 6.0-liter V8 that pumps out 366 hp and 380 lb-ft of torque is optional with the Yukon XL 1500 SLT package. Both 1500 engines are matched to a four-speed automatic. For the 2500 model, the standard engine is a 6.0-liter V8 mated to a six-speed automatic that packs 352 hp and 383 lb-ft of torque. The Yukon XL Denali features a 6.2-liter V8 (380 hp and 415 lb-ft) paired to a six-speed automatic transmission with a manual-shift mode. Two-wheel- and four-wheel-drive versions of the Yukon XL are available, except on the Denali, which is equipped with an all-wheel-drive system that doesn't have low-range gearing. Towing capacities for the regular Yukon XL range from 7,100 pounds on the 1500 2WD to 9,700 pounds for the 2500 2WD.
I think the newer ones come with a 6.0 option. I bought this used so took it with the motor it had. Wouldn't want a 6.0 since we had one in our chevy crew cab pickup. Sucks gas to fast for the gas stations to show up. Our 5.3 will get only 9.5 to 11 pulling 4 place enclosed snowmobile trailer. I have to admit Dave that I was shocked about that trip getting over 20mpg, but told my wife it was because I was in the driver seat and not her. Our 2000 suburban did about 24mpg on long trips. Dont ask about the 2003. They all had 5.3 engines. Very good engine in mind.