OP here. Can't sleep, it's almost 4 am and I have nothing better to do.
Looked through my fuel mileage records and decided to add here.
The last 4 tanks I've been averaging...
23.7 (80/20 high/city)
24.4 (same)
19.1 (more city and went to a fuel station that used ethanol)
23.5 (80/20)
I also did a hypermile tank for the hell of it as well and managed just over 27 (90/10 highway city). It really was tedious though, trying to let off the fuel whenever a hill was and gauging throttle, hoping I didn't hit a traffic light whenever I was in the city.
I also then did a "drive it mad" tank, but surprisingly I still broke 21 mpg.
Keep in mind though my truck has no spare (or tools), is 2WD, and a gutted interior (only front door panels, front seats and front carpet, the rest is down to the sheet metal. It also started with very few options.
Just FYI