According to this graph, the increase began following Trump's election.....
https://www.eia.gov/energyexplained/...uctuations.php
Why do gasoline prices fluctuate?
Retail gasoline prices are mainly affected by crude oil prices and the level of gasoline supply relative to gasoline demand. Strong and increasing demand for gasoline and other petroleum products in the United States and the rest of the world can place intense pressure on available supplies.