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A fairly unknown practice among car owners but well practiced in professional motor sports and even bicycling is to
fill tires with pure nitrogen instead of plain old air to keep things inflated. Nitrogen basically keeps the tires
inflated longer without the need to refill. The only problem with filling your every day commuter with nitrogen is its
scarcity and cost over traditional air. But the benefits could include better mileage and in today’s fuel pinching
state of paranoia that could make nitrogen pumps a common site.
Thanks to Frank for the tip.