Ray,
It's tough to get mileage out of a truck, until you get up into the current stuff. But 12 seems low. Did you check compression? Probably don't a have a tester with you. If you were to swing back this way, we could easily do that. Especially if I know you're coming. Does that have hydraulic lifters? If mechanical, a valve adjust might be in order. We could do that,too. I suppose you're already in Colorado or New Mexico by now, though. Even though plugs look ok, new ones might make a heck of difference.
Got the desperately needed haircut. The guy just fired up his lawnmower and made a couple of passes.
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