mod or performance

New here to the forum! Hey Everyone, So I've had an account for a while but never introduced myself to the forum community. I have a Black Mica 2010 Mazda 3s Hatchback and I'm looking to continue to mod her out. I know some think its completely ridiculous to name their car, but her name is...

I purchased my 2010 GT 2.5L about 6 months ago. I love it but I would like to be able to squeeze a bit more performance out of the engine and improve fuel efficiency somewhat. I live in South Florida. I have been told that for other cars, such as Mitsubishi EVO and Subaru STI, there are things...