My wife commutes 50 miles a day in our 2014 Escalade. 35 miles is a state highway at 60 MPH. The rest is in town will stop lights. While the Escalade is averaging 18 to 20 miles per gallon with the AFM deleted.... LOL, I must mention that she gets scared if she gets it over 2,000 RPM. I got her a set of pirelli scorpions, she has about 30,000 miles on them.... Not even 25% worn. Yep, her 6.2 should go at least 400,000 miles. She used to drive a Ford excursion with the 6.0 powerstroke.... But I got tired of having to blow out the carbon on the weekends ;-)