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I put light truck tires on my Pickup for a couple of years, and it had a significant deleterious effect on the fuel economy, about a 15% drop if I recall. I seriously hated them and even though I was seriously poor at the time, just as soon as I could call them "worn" and had a bit of money saved, I replaced them. My mileage came back immediately.
The truck rode better too.
If you don't need the LT tires for their load capacity, I strongly recommend you avoid them.
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Lead or follow. Either is fine.
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