[02Eclipse]

Hello everyone! I've been a lurker in this forum for several years and have found this forum incredibly useful and want to thank everyone who contributes immensely!! I've been driving an 02 Mitsubishi Eclipse RS for about 6 years and would like feedback on my ride. I currently have a coroplastlast rear undertray (from the rear subframe to rear bumper), wheel spats on front and rear, I used to have a coroplast front undertray from the front bumper to the end of the engine compartment ( until it melted from leaking coolant). I'm averaging about 28mpg in the city (San Antonio, TX) any suggestions? My thoughts so far, a new full bellypan from front to rear and partial grill block including relocation of front licence plate. Any suggestions? ( I do have a scanguage 2) Thank you all.
Scott from San Antonio