Writing the last check to bank tomorrow on the grand prix, kinda happy about no more car payment!

I was thinking of getting some window tint due to the occasion
anyway looking for some pics of 04+ gps grey/blue in color with between 20-35% tint on them

Also to get on the subject of getting better mpgs im kinda wanting to see if i can get a few more mpg's! So heres what my maintenance looks like,
When i put the new motor in about 10k miles ago i put in
New plugs and wires,
180*stat,
New cone filter (and fuel filter 20k miles ago),
New s/c oil and im sure a few other things
Yesterday i was bored so after changing the oil i regapped the plugs to .055 or whatever 55 is on the little gauge, Changed the fuel filter, cleaned the MAF and throttle body

Now pretty much all of my driving is down the hwy doing 70mph and i seize most opportunitys to floor it, Just being blunt here, anyway mpgs last i calculated are 20-22 mostly hwy, i would like to do a little better, and quite frankly changing my driving habits is unlikely to happen, so my question is, is there anything else i can replace to get it better mpgs, i have no CELs and the car runs perfect

Also i am thinking about running my car up to my tuner and getting some timing advance pulled for the upcoming winter, hoping to get a little better mpgs and maybe the lack of power that im used to might calm my right foot your tint pics, opnions/comments are welcome