2015 CX-5 mpg vs. 2016 mpg-Computer Flash?

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2015 CX-5 GT
Sorry if this has been asked before. I couldn't find it. Does anyone know specifically how the 2016 CX-5 gained one mpg over the previous models? Was it a computer flash? If so, was there a downside, either way, flash or no flash, to performance. Could the change be applied to the 2015 CX-5?
 
Sorry if this has been asked before. I couldn't find it. Does anyone know specifically how the 2016 CX-5 gained one mpg over the previous models? Was it a computer flash? If so, was there a downside, either way, flash or no flash, to performance. Could the change be applied to the 2015 CX-5?

the 2016 FWD model has a taller final drive ratio than the 2015..
I Don't think the 2016 AWD model gained anything.
 
Did the taller final drive ratio increase the time to 60 mph? Quarter mile? I like that the 2015 is in the sevens to 60.
 
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