In California, it is unlikely that you would need a major tune up, plugs and such but that would be the place to start even if you recently passed a smog test.

You don't give a clue as to what your present mileage is. Knowing that would give a better clue to anyone trying to help.

Anything and everything pertaining to maintenance, Even simple things like keeping the car clean and polished to reduce aerodynamic drag.

Your car has a factory cold air intake. REmoving it and installing an aftermarket unit will actually reduce your MPG. However, switching to synthetic oil can add about 1MPG

Read this post on why aftermarket cold air intakes are worthless

http://ricksfreeautorepairadvice.com/col...

Replace your air filter once a year.

On the freeway try not to drive above 65 to 70mph

synthetic oil, expensive but you will get a tad bit more mpg

if you don't mind me asking how bad is your mpg right now because Toyota corrolas get about 33mpg city and 38-40 mpg freeway.

So if you are not getting anything close to that then you may want to get your fuel injectors cleaned. that will help you get more mpg

You can buy those bottles to clean your fuel injectors but don't buy the cheap ones and follow the instructions carefully about only adding to your gas tank after you next fill it up and read to see how many gallons must be in there

Synthetic oil will help also cold air intake maybe 2-4mpg increase keep your foot off the gas haha

I would love to increase my mpg more I been trying to drive smarter and keeping my car empty and tire pressure inflated, but wandering what else I can do, like more driving tips or parts like cold air intake or something, I live in Los Angeles, California so air conditioning removal is a no but I'm open for suggestions and how about synthetic oil or transmission fluid ect ?