Hi, Peter - welcome to the site.
I'm going to guess (having done & attempted to measure each of those - except the rear wiper delete) that you'd see something around a 5-8% fuel economy improvement with all those mods, at speeds around 55-60 mph. More at higher speeds, less at lower.
With your interest in your car's fuel consumption, I'd also recommend building yourself an
MPGuino. You'd have fun with it.
Darin