Join Date: Jul 2008
Location: Orangevale, CA
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Here in CA, fuel is hovering around the $4 mark.
You already have an intake, tunes and straight pipes so you got those mods done.
You're probably doing the best thing. Keeping the revs low and going slow. Make sure you keep your fluids changed on schedule, make sure your tires are at the right pressure, minimize morning warm ups (if you can). Getting 22 on the highway is good. I only get about 17-18 on the highway, but about the same as you in town.
You could reduce some weight to see if that would help. I see you have grill guard bumper and headache rack in the bed. It looks like you have a tool box, but not sure. "Experts" say carrying extra weight affects mileage.
Unfortunately, trucks, especially full-sized, diesel powered big boys like we drive aren't known for being fuel mileage kings.