You can run alcohol, or if your not extremely cheap goto an AutoZone and pick up some fuel injector cleaner you just fill your gastank with it after filling up and run the car normally

 

which are some good fuel injection cleaners?

 

Lucas products are good. Also change the fuel filter. i did and got my MPG back. I was gettin close to what you are(a little more 180-200) before the light came on.Also change your distributor cap and rotor, just make sure you do not break the bolts for the cap. They twist very easily. Also make sure the rotor goes back on perfect, or you will throw a CEL I did all I said, and just got 283 before the light came on. I still need to put air in the tires, but I need new stems first

 

I am guessing the biggest culprit is probably your 17's. When you switch to your 15's it should go up. But there are some things that can help:

-You can switch to synthetic(it helped my mpg)
- check your tire pressure psi(a couple of pounds low can really affect you mpg)
-any of the major brand Fuel injector cleaners will work(i used STP recently)

 

Ive pretty much done a full tune up with all oem honda parts. Only this left is to change the O2 Sensor which Im waiting on. Im gonna try the FI cleaner and see if anything changes. How many PSI should I be running? I usually have them around 32 at all four corners.

 

Look on the tires, they should tell you. It all depends on the tire