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I have the "7 speed transition. May build date 2013. I can only get 23hwy MPG

What changed that made the 2015 get better mpg?!?
 

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I have the "7 speed transition. May build date 2013. I can only get 23hwy MPG

What changed that made the 2015 get better mpg?!?
You have a CVT, belt transmission. The 2015 model uses a newer CVT chain transmission. With each new design designers are able to make the overall system more efficient, less parts, etc... Thus the slight improvement in mileage. Officially it's a 1 mpg improvement.

BTW, some QX60 owners will kill for your more "reliable" belt-transmission.
 

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QX60 gets 20/26 while the Pathfinder gets 20/27.

That 1 mpg can be accounted for in the additional QX60 sound deadening, different parts, etc...
 

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The newer CVT has a wider ratio range, so its cruise RPM is lower. It also uses less ATF in the case "bath", so there is less viscous friction.
 
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