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I run our Sienna Mini-Van in the low forties. It makes 2+ MPG over the 32 Costco set them at. As a side note I remember growing up as a kid all the Pickup trucks with 8 ply or greater tires had 45 PSI written on the sidewalls. Any guesses where most people ran them all the time. It was just too inconvenient to run by a gas station to fill them up when you need to haul a load of firewood, gravel, etc. Just information.
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