I ran LTs on my Toyota for a few years and dropped about 10% fuel economy that whole time. The truck isn't heavy enough and is rarely heavily loaded enough for me to even worry whether passenger tires are up to the job, and I went back to passenger tires as soon as the LT tires wore out. Got my mileage right back on the next tank.
I'd be interested to see what effect yours have with your van.
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Lead or follow. Either is fine.
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