Gasoline prices have been climbing. The U.S. Energy Information Administration (EIA) reports:
The average U.S. retail price for regular motor gasoline has risen 45 cents per gallon since the start of the year, reaching $3.75 per gallon on February 18. Between January 1 and February 19, the price of Brent crude, the waterborne light sweet crude grade that drives the wholesale price of gasoline sold in most U.S. regions, rose about $6 per barrel, or about 15 cents per gallon.
By far the largest factor in gasoline pricing is the cost of crude oil – and the cost of crude has been rising since mid-December, as this chart shows: