Hey Monkey Madness your into newer cars I'm guessing, do you have any idea how to get better fuel mileage out of a 2012 Mazda 6 with a 2.5. And maybe some more hp without spending lots of money?
If not, freer flowing intake filter or box, exhaust and a tuner flash would do well.
nothing racy just a good mpg tune would help a ton. the 2.5 Mazda/ford motor is pretty stout.