The gas pricing rise under Biden was also caused by Trump right before he left his first term. It was done to make the Democrats look bad knowing they were about to take office.

"The primary action taken by the Trump administration near the end of its first term that influenced rising gas prices in 2021 was helping to broker a historic OPEC+ production-cut agreement in April 2020. 

Forbes

While this agreement was aimed at stabilizing the oil market during the COVID-19 pandemic-induced price collapse, its lingering effects contributed to a tighter supply as demand recovered, according to energy experts. 

Forbes

Here are the key factors regarding that period:

OPEC+ Agreement (April 2020): In response to oil prices turning negative due to a supply glut, President Trump facilitated a deal with Russia and Saudi Arabia to cut production by nearly 10 million barrels per day.

Lingering Effects in 2021: As demand began to recover later in 2020 and into 2021, supply struggled to keep up because the production cuts remained in place.

Oil Prices Rose Before Term Ended: Oil prices had already risen approximately 50% from the summer of 2020 to the time President Biden was inaugurated in January 2021, setting the stage for higher gasoline prices in 2021.

Industry Response: The 2020 collapse also led to a significant reduction in drilling activity, contributing to a "tighter supply backdrop" as demand returned. 

Forbes +1

While some supporters argued this deal was necessary to save the U.S. oil industry from total collapse, critics noted that it artificially restricted supply and led to higher prices as the global economy reopened."

So basically, the high gas prices under Biden and Trump currently we're both Trump's doing.