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Slipstreaming behing a big rig is dangerous. How often do you see pieces of tread from a rig on the side of the highway? A lot more often than you see dead animals or other debris. Where do you think those pieces came from? As someone else pointed out, it can do a lot of damage.

Nitrogen in tires is just the latest consumer fad. Air is 80% nitrogen already. This idea started in racing so the pit crew could accurately predict tire pressure variation as the tire heated up under racing loads. And as far as fire protection, forget it. There is a lot more air outside the tire than in it, and all that air has 20% oxygen that will support combustion.

Want to save gas? Keep tires properly inflated, get a tune up (include changing your air filter), and don't accelerate too fast.
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