I used to have an old Dodge 3/4 ton 4x4 truck when I lived on a local "mountain".
I'd start it up in the morning, crawl 200yds to the crest of the hill and coast downhill in neutral. With the rugged bias ply tires I'd see about 50mph max on the coast downhill.
Well, I bought a lovely set of Michelin radials. That first morning I had to WHOA! put on the brakes as I was achieving 70mph in the old truck. The difference was amazing.
We don't have tires that bad anymore, but rest assured there are gains to be had if you need new tires.
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