2016 CX-5 AWD vs 2015 FWD - MPG

My 2016 averaged 37 mpg highway on a 3 hour trip to the beach a few years ago, happened on a set of new Nokian tires, never go that kind of mileage before those tires.
 
Have you ever checked for dragging brakes on your 2016 AWD? Your's has (potential) problematic rear brake calipers that stick.
Does that apply to 2016 only?
Dealer replaced rear brake pads half a year ago on my '21 and last week they told me pads are at 6 (out of 10)
 
Does that apply to 2016 only?
Dealer replaced rear brake pads half a year ago on my '21 and last week they told me pads are at 6 (out of 10)
Idunno if other years had service bulletins about the rear calipers.

Rear pads 40% worn in six months seems excessive but idunno your driving environment or style either. Your oem pads lasted 3-4 years so this wear on your replacement pads isn't lining up.
 
To the OP, super dumb question and don't take this personally, but are you sure your girlfriend's car is a 2.5L? My 2.0L FWD never dips below 30mpg, even during the winter time with extended warm-ups. Summer is 33-35mpg. There are two other CX-5s in my family, both 2.5L AWD, and they sit around 25-27mpg with mixed driving.
 
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