My cousin and I recently swapped vehicles. I drove his 2014 Murano, and he drove my 2013 edge SEL. I found that putting around town, driving local same roads going to the same locations same speed etc... I found the Murano to be better on gas mileage. On the highway the mileage was pretty simmilar.
I actually enjoy the way the Edge handles over the Murano. They are very simmilar vehicles. If you can get the sport the sport trumps it hands down.