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My take on the Yukon hybrid is it is the best darn stop start system you can get. The vehicle can be driven on electric only for a short distance, very similar to the Prius, but generally runs the engine by 10mph from a stop.
Our Denali is 4wd, doesn't have any of the aero enhancements, and has the 22"wheels. We average about 19-21 mpg but it is still better than the 12/18 rating of the non-hybrid.
If you want better mileage from one of these, just slow down. By far the least efficient aspect is the aerodynamic load.
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