It is time to do a checkup...........
I would ask for a compression check on your cylinders so you can find if your piston rings are on the way out. Lift the truck up on some real ramps and look and wipe for any oil trying to leave. Is it time to change some oil rings?
Excessive oil consumption is indicative of some oncoming major work. You are also doing a lot of stop-and-go driving which is a lot harder on the engine. Try some Motor-Honey or Lucas Oil Stabiliser, let it idle, and then see if there is a performance difference.
For the time being:
Think of getting a oil one-shot to the top of the engine. It is a gadget, a reservior that pours motor oil onto the top and then you start the vehicle with it fully lubed. They put it in vintage collector vehicles.
Since you are already doing that, why not think of putting one in?
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