The off-road industry uses a lot of bias-ply tires solely because of their durable nature (fights sharp rocks) and flexibility (better traction when aired down). Interco Tires is one of the best at this esoteric group. Gas mileage is not a priority with an off-road only vehicle. Most of the time these are only wheeled on the trails on the weekends for only 20 or so miles so the impact on gas mileage is not as important as performance.
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