So after reading all the terrible mileage questions and answers about the 6.2 I did a trip yesterday from northern NV to Scottsdale AZ and I ended up with a mileage or 20.9 after 721.4 miles at a average speed of 70 on the computer, a lot of the drive was in the low to mid 80 mph. Is this normal with a 6.2 ? Or did I just get lucky. I am running premium fuel as recommended. Stock wheels and tires. My brother gets this mileage in his 5.3 RST but I didn’t think the 6.2 would.