My Jeep Wrangler will gain 2mpg/tank even with only 50% highway. But some of that is at a slightly slower speed. At a 3W distance(3 wrangler) I can hear a large reduction in wind noise and feel the resistance drop. Tankers are best. Any closer and may as well be towed. Rocks, blown tires, eh. What, you want to live forever? Keeps your reflexes sharp.
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