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Hello Tmugz88 - welcome.
I had a 2016 Spark but it was the EV. First things first - is your goal to save money or to save fuel and show the highest MPG you can? (We have people on Ecomodder in both camps) I ask because you could spend $1000 on new wheels and tires to save $100 in fuel.
14 inch wheels will work on your car (Tire Rack sells them). When buying a used wheel be very careful to research and make sure the bolt pattern, size, center hub and offset are all correct.
Personally I run about 45 psi in my tires. Near the max pressure but not over it. I also run higher pressure in the front than the rear because I want more neutral handling.
One easy thing you could do is get rid of your spare tire, jack, and tire change kit. The Spark EV did not have one and just had a factory air pump with tire sealant. You could buy a can of fix-a-flat and save about 30 lbs of weight. That depends on your risk tolerance. My 2017 Bolt didn't come with a spare tire and I bought a Spark spare from a junkyard because I've had enough flat tires to always want a spare with me.
You could also remove the rear center seatbelt if you don't need it for small kids or car seats.
Another easy thing is a grill block. Most of your center grill is blocked off already but you could use tape, cardboard, or some custom made plastic panels to block off more of the grill. It is likely way oversized for use in Northern Wisconsin and is sized to flow enough air to keep the car from overheating going up steep passes in death valley at 120F outside temp. Just keep an eye on your temperatures (I blocked about 30% of my grill in a 2003 VW TDI and 2004 Prius while living in Alabama with no issue)
For a factory look you could buy the top grill from a Spark EV
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