I'm jealous, I have the 2011 and get about 15/18 avg I'll get in the 20's during a long freeway trip, I've seen it average as low as 13.5 when zipping around the streets. I swapped the factory filter for my K&N panel when I bought it 2 months ago but when it came to clean the K&N, the factory filter made no difference in HP or MPG. It was probably just letting more dirt into the engine and someone made a good point about newer cars and the MAF adapting to the added airflow anyway which made total sense to me (but let's save that convo for another thread.
I filled my tires to 34psi warm but I still need to check and fill them when cold...
Once I get my next oil change while keeping the factory filter, confirm 35psi when cold I'll pay closer attention to MPG and hopefully start getting some better numbers like you. I doubt the 2 year difference in models should account for it but who knows...
Your Edge mpg are very low.
My edge was doing at least 16-17 city before I did any work on it with a dirty air filter when i first bought it.
My mileage increased a bit( about 1-2)when I installed my AFE performance air filter and the throttle response increased.
But I feel that I really probably did not get any real horsepower increase, maybe 1-2 hp.
However my Edge do seem more peppy at high rpms with the AEM filter and it make passing a bit easier.
Most aftermarket air filters help non-turbo/supercharge cars just a little, unless they come with very restrictive air filters stock, even then the throttle body size limits any additional airflow, so you will not have much of any noticeable gains beside a bit more mpg and some engine responsiveness with just a drop-in air filter.
Which some owners can feel and others can not.
Synthetic oil also helps increase mpg.
I gained a couple when I started to use Mobil 1 synthetic 5w-20 over the dealer stuff.
I have my tire pressure set to 36 psi cold, and my mileage is an average of about 20-21 mpg in normal city driving(more or less depending on the traffic and hills), but I have the 3.5 engine.
I believe that you will see better gas mileage with your tires having more inflation.
As it stands you are probably having tires that about 28-30 psi cold, hence under-inflated.
You should only set your tire pressure on cold tires(sitting over night if possible).
Edited by carguy75, 14 August 2015 - 08:52 AM.