For most cars, higher octane gas is a waste of money. Regular unleaded(approx. 87 octane or so) is the least expensive and what you should purchase. It's important to remember that octane is a measurement of how hard it is to ignite the gas, not the quality of the gas. Purchase mid or high octane gas only if your engine pings, knocks or rattles when using regular unleaded fuel.
If you need to do a quick approximate measurement, a dollar bill can come in handy. Currency printed since 1929 is about a half foot in length (6.14 inches by 2.61 inches)
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