The Democrats promised to do something to force people to stop consuming gasoline. Raising prices is one way. This reflects a quasi-religious belief that carbon emissions are a threat to human existence. The Democrats won the election (fair and square, with a bit of help from Trump’s bungling), and they are keeping their campaign promises. Biden keeps his promises – blame the voters who elected him.
Also if you are pay $70/tank for a not too big car, you should consider moving to a state that support pipelines, refineries and therefore, lower gas prices.