Few questions for easy, $0.00 modifications

[FLAteam]

Hi, I'm new and I finally decided to join the forums. I drive a 96 Civic DX hatchback, automatic, in Florida (no problem with having a cold engine here). I average 32 mpg (EPA 29-36). Here's a few things I've done to increase my fuel economy:

Driving technique (slower accel, less braking)
Tire air pressure 40psi
General maintenence (spark plugs, wires)
Wash/Wax
K&N drop-in air filter
Slow fuel filling, filling when cold
Synthetic oil changes every 3000 miles

I believe in the "miles per dollar" method, so I'm not out to get high mpg just for the sake of high mpg, but rather to save money all around. I don't want to go spend $400 on some VX wheels with LRR tires just so I can get 1 mpg or $200 on an aftermarket header just so I can get another 0.5 mpg. It just doesn't make economic sense in my opinion.

My questions include:

1. What more can I do that would cost little to no money to get higher mpg? I'm not very technical, but I can do basic stuff like oil changes.

2. Would coasting in Neutral (my car is automatic!) help?

3. Would removal of the exhaust manifold heat shield help?

Thanks!