Pump tires not gas. And if you're really going for it, you'll give someone a pump on your commute to work as well.
Wait, wait, wait. Before you go thinking something dirty, get you mind out of the gutter and remember that when someone sits on your front handle bars it's called "giving them a pump..." Elementary school wasn' that long ago.
Anyway... giving someone a pump while riding your bike to work is taking two cars out off of the road, thereby further decreasing your carbon footprint. Which, by the way... is anyone heading towards PalmerCash? I need a lift...
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