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You bring up many good points. I do keep the front and rear pressure differential the same for safety and handling reasons. This is funny because I acknowledge that over-inflating tires will cause longer braking distances, increased rollover tendency and create a stiffer ride, and yet I still do it.
An SUV, a pickup are already burdened by a high center of gravity. The Ford Exploder fiasco showed what a problem that is when pressure and load are not matched. "Low" factory pressure isn't about soft ride it is about many qualities. The quality of the best tire, along with sane pressures, is the way to go, IMO.
The trucking industry -- and NO ONE knows more -- will be the first to tell you that tires last longest when inflated properly. So the question about "economy" has to do with replacement costs. If I overinflate my tires but can only travel 80k on them I've not only lost money but I know that I also have made the ride, the handling, the braking, etc, all worse.
I find this to be an easier way to look at it. The small percentage increase can be found elsewhere without terrible offsetting penalties.
In the end, the very best tire is the cheapest (life, performance, reliability) but only when used properly.
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