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what about filling tires with Nitrogen - it's said to result in a 4% on avg increase in fuel economy (not sure how true this may be). Not only that, it's cheap to do, costs $5 per tire typically and results in more stable tire pressure (when heat builds from driving and changes in temperature). This one's fairly controversial in terms of its effectiveness but so are some of the other items on the list. Oxygen has an atomic weight of 16 while nitrogen of 14. Doesn't look like a big difference, but it is a 12.5% decrease from oxygen which may not mean a whole lot at the end of the day when it comes to a potential approx 10% drop of the weight of the volume of pressurized gas in your tire. Have i tried it? Not yet but I plan to soon.
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