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Amazing for a full size SUV.My Yukon XL has a lifetime average of 27.5 for 7750 miles. My best tank was 31.5. Now that it’s cold out it’s a little worse. I haven’t towed yet.
People don’t believe me until I show them my mileage on the dash.Amazing for a full size SUV.
We tow a 28 foot Airstream weighting 8000 pounds. We go see our grandkids in Shreveport often, so we make this trip a lot. On I-20 across north Louisiana we get 15.3 mpg on average. We pull our trailer at or near 68 mph. Our round trip is around 350 miles. The truck handles the trailer very well. We drop from a 6.6 Duramax which got 12.5 mpg average on the same trip.Looking for mileage while towing a camper, mine is 5000 lbs. I know what my 5.3 gets (not good) curious to know what others are getting with their GMC Duromax diesels