Running max sidewall pressure on tires on a truck or van or vehicle used to haul heavy loads is asking or a blowout due to overheating of the tire. Been there, done that. The max inflation trick works for lightweight passenger cars than don't carry much of a load but is dangerous on working vehicles. When you are operating a load carrying vehicle you really do need to follow the manufacturer's recommendations for tire pressure. And if you have a truck or van you should also run light truck tires, not passenger car tires.
I figure that getting 13 MPG highway in a full size van carrying 3+ passengers and their luggage for a weekend trip and travelling at 70-80 MPH is pretty decent efficiency.
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