A lot of factors go into determining the price of gasoline, so it’s worthwhile every now and again to review them. A good piece in last Friday’s Wall Street Journal does just that, asking simply why gas costs what it does. The author – an analyst for a taxpayer watchdog group – gives a quick rundown of the basics, like crude oil costs, which can account for roughly three-quarters of the price consumers pay at the pump. Then there are expenses for refining, distribution and marketing. But he also reveals one slice of the gas price pie routinely overlooked by those who criticize energy companies or gas station owners for high prices. He writes, “The truth is that governments rake in a larger profit at the pump than anyone,” including companies like ExxonMobil.