If it was full when you started out and after you went 126 miles you filled it again then your correct.
Driving habits dictate MPG. Was it all highway, all city, a mix? Do you have a heavy right foot? Do you shift at high RPM'S?
I have a 04 4 cyl and when I commuted 100 miles RT a day 95% highway, never exceeding the speed limit, drove in the truck lane up hills not trying to maintain highway speeds (the trucks passed me), shifted like the old man I am, I could eek out 19 MPG on a regular basis.
Now that I am unemployed I go no where but around town and don't even try to calculate it. And I NEVER warm up the jeep, oil pressure is up I am on the way. There is no need to warm up the engine unless your a baby and want heat before you get in it.
Not sure what or why you want to replace all the bushings, have mine since new and the only thing I had to replace is a sway bar link.