I just returned from a 3,500 mile trip in my 2014, SRX, performance. I now have a bit over 11,000 miles on the speedometer. We had the air on full time and the vehicle was fully packed. I probably averaged 80 mph, since 3 of the states had a 75 mph limit and the others had a 70 mph limit. I drive right at 8 mph over the speed limit. We got 21.1 mpg figuring it by hand. I never did check what the car info said. I was happy with that mileage considering the speed we drove and the load in the vehicle. I thought it had plenty of pick up and tracked very well for the type of vehicle. There were no problems, no squeaks or rattles and we were comfortable for the long drive.