Anyone who drives a car understands the sting of having to fill up their tank and pulling into the gas station, only to discover that gas prices have skyrocketed. Paying extra for gas means you have less to spend on other things, which, over time, can really put a crimp in your budget.

Cheap Insurance explored some of the reasons behind major changes in gas prices, and compiled a list of the cheapest gas stations in Boston, Cape Cod, Springfield and Worcester using data from Gas Buddy .

Gas prices fluctuate based on several factors, including the cost of the key ingredient, crude oil, as well as the available supply and demand for gasoline. If the price of oil rises, a major refinery goes offline, or more drivers hit the road, for example, the cost will increase.

In the first half of

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