[slowmover]

A half tonneau is said to equalize the air pressure ahead and behind the tailgate.

Get you a CAT Scale reading, the adjusted empty weight (which is driver, full fuel and permanent supplies and tools aboard). And use CapriRacers instructions/advice on how to dial in tire pressure -- inside vehicle manufacturer numbers -- by monitoring pressure rise from cold after 1.5-hours of stready=state driving (highway). Best tire life, braking, etc, will be with that ideal number (and, obviously, more scale readings and TP adjustments to know how in the future to adjust them for differing loads).

As it is a pickup I woudn't wait, but upgrade shocks ASAP. KONI or BILSTEIN. Same for changing to polyurethane anti-roll bar bushings. If there is no rear bar (and you want to add one) the front should probably be up-sized by percentage. Be careful as trucks are notorious for the RR axle getting loose.

Do you plan to be towing? Is that the reason for a pickup? What is the trailer spec in that case?

Will you be working off a fuel log and previous calendar year fuel budget? That is, to make both the comparison in mpg truck-to-truck AND in reduction of miles driven while accomplishing the same work? This was the first step I made in taking my truck to 23-mpg from the previous 18-mpg in-town average over a distance of 1,100-miles. I've since backslid to 19, but the total miles is reduced.

The mileage-driven reduciton (cold start, etc) is where the money is on a pickemup. Do the same normal errand runs . . but do them in fewer miles/trips.

.