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an engine serves absolutely no useful purpose, it burns more gas, it causes unnecessary wear and tear on the engine, and it makes you look like an idiot.

10. Gas density - The colder the gasoline when you fill up, the denser it is. This means that you can save money by just filling up during the coolest hours of morning. It doesn't increase mileage, but it does put more in your tank per dollar.

11. Pumping your own - In many places, it is illegal to pump your own gas. However, if you do, set the nozzle to a lower fill rate, like the middle rather than full bore. The faster gasoline flows, the more of it that evaporates. Most commercial gas pumps have an air retrieval system that sucks the fumes back out of the tank and back into the station tanks. This will save them money, but you've already paid for the gas that has been vaporized. Lower the speed of fill up, and you will save money in the amount of gasoline that stays in your tank. Again, this doesn't increase mileage, but it will save you money.

All of these things combined can potentially save you a great deal of gas and money. They are definitely worthwhile to know, for anyone. If you know someone who drives and who hates the high cost of gas, let them know how they can save money. The more informed each of us are, the less dependent we are on oil, the more money we save, and the less we foul our air.

Learn more about this author, Rex Trulove.
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