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For the first ever exercise in Rough Equivalents I’ve picked Energy as the topic, most notably the amount of energy in one American gallon of gasoline/petrol (128 fluid ounces). The energy available in an average gallon of gasoline, measured in joules, is around 121 megajoules, or 121 million.
Sources:

www.rough-equivalents.com
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Anderson was paying 63.8 cents per gallon equivalent for compressed natural gas, making Utah a hot market for vehicles that run on the fuel. Its the countrys cheapest rate for compressed gas, according to the Natural Gas Vehicle Coalition, and far less than the $3.56 national average price for a gallon of gasoline. We got [...]