Fuel prices in the United States have fallen significantly in the last decade and now range from $2.50 to $3 a gallon.
But the price has fallen for most other fuels too, from $1.70 a gallon in 2009 to just $1 in 2014, according to the Energy Information Administration.
For example, the average price of a gallon of gas in Pennsylvania is $1,878.
Gas prices have been falling across the country since 2014, but are still relatively high in parts of California, New York and Texas.
Some states have seen price increases of as much as 10 percent.
But there are signs that things are starting to calm down, especially in the Midwest, where gas prices have dropped significantly in recent years and are starting out to be less expensive.
Fuel prices can fluctuate dramatically based on demand, weather and other factors.
Some analysts are predicting that prices will return to normal by the end of this year.
In some places, the price is expected to be about $3.50 a gallon by the beginning of 2019.