At $0.184 dollars per gallon and 375 million gallons per day consumed (or purchased) the government take is about 69 million per day or over 25 billion per year.
That seems like an awfully low number. Another thing is, the government dips into the oil well many times before pump taxes are taken. They take a cut at the well, then sip from the bucket as it's carried to it's final destination, the holding tanks at the gas station. Those are hidden taxes, which the final pump tax taxes again. Now they want to add a carbon tax along that route as well.