I wanted to wait to comment to this post until after my first oil change. I, like many others didn't have the best mileage out of my 2012 5-door CVT when new. But after my first oil change (a little late at 8k), filled with Mobile 1 and a Bosch premium filter, I also put an AEM filter on at the same time. My average mileage (according to the computer) would hardly ever get close to 36 on long flat highway cruises in TX before the oil/filter change. Now I am happy to comment that even with the AC on and not really paying much attention to efficient driving, the same computer is registering on the higher end of 36, even saw some 37/38 figures briefly. Now I haven't calculated my actual MPG yet, but I figure that if the computer was registering under 36 before, and now is registering above 36 without me disconnecting the battery (if that really changes anything) then its still an improvement. I'll update later with an actual calculation.