Yeah, lots of factors. I’m stock (no bumpers, etc) other than 3.5” & 315s w/ stock gears, but most of the ignition/running parts and all fluids are pretty fresh. I average 13 (GPS calibrated) with at least half cruising 50-60, the rest mixed 35-45 and “in town” driving. Saw 15.5 on a constant 50mi stretch at 60 with a few mild inclines, worst I’ve seen was 12 when I did more short non-hwy drives. I’m happy with that it’s interesting watching the stats via OBDII reader as you drive.. mileage goes all over the place! This is my first tank on the new tires and it looks like there miiiiight be a little improvement.Although there are lots of people who say no fuel gains are seen with a part time kit, I feel like it could play a role in my good fuel efficiency. Less than 120,000 on the odometer and lots of maintenance could also be the cause. It is hard for me to say because I never got to drive the rig before and after the part time kit.