Interesting Tom. My Yukon is a 2016 and performs almost exactly the same as yours. We just went to Lancaster and I noticed the mileage dropped to19+ on the way back but was in the low 20s on the way there. Might have something to do with the wind direction but who knows. Like you I always run 87 octane, usually Chevron. Hint buy gas at Vons in Bishop for about 5 cents cheaper than anything in town. Mike
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