Welcome to the site! It looks like your ready to go.
That is great, but as NoCO2 said your largest gains will be from driving style. In fact, if you have a manual transmission I'm absolutely sure you could get 45 mpg without any modifications at all. I have a 2003 Matrix (larger and heavier than your Corolla) and I have gotten 43 mpg under some bad conditions and without hardly any mods (I had a grill block at the time). I'm sure I can get 45 in it, so I'm sure you can get that in your lighter and smaller Corolla (since they went a lot larger in 03).