Suggestions for cheap and easy mods? Dude, you're all over this, you're already doing them.
And welcome to the forum, by the way. Funny, trying to read up on North Alabama I see it's sometimes referred to as the Tennessee Valley. I'm also in the Tennessee Valley - the one in East Tennessee.
I see your car weighs in at about 2400 lbs, a featherweight by modern standards but not especially lightweight in the EM garage. Go ahead and start a fuel log for your car, it'll help you keep track of what works and what doesn't. Make one change at a time, watch it for a couple of tankfuls and see what direction the mileage moves.
There's a
sticky at the top of the listing under Ecomodding Central that has a bunch of mods you can try.
There's another
sticky at the top of the listing under Hypermiling/Ecodriver's Ed that has a bunch of tips to help you hone your technique. Pretty much anyone here will tell you that for return on investment, nothing beats adjusting the nut behind the wheel. It costs nothing to change how you drive.
Anyhoo, welcome.