I just recently switched from a '21 Yukon at4 5.3 to a '22 Yukon at4 6.2. Right away i noticed the 6.2 had a big increase in fuel mileage of 18 mpg on interstate going between 80-87 mph. I couldn't dream of ever getting that with the 5.3. Best i seen on the 5.3 was 16 mpg and that was best...
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