It’s official: the EPA’s regulations to reduce the amount of sulfur in gasoline by two-thirds will go into effect were easily the most expensive rules issued by any federal agency in 2013.

While the rules have been criticized for a number of reasons—giving too little time for the public to comment, increasing the cost of gasoline, and for only reducing ozone pollution by less than one percent—a new analysis from the American Action Forum finds that the rule will add a paperwork burden of more than 160,000 hours annually and cost $35.1 billion.

It’s no wonder a bipartisan group of Senators, including David Vitter (R-La.), Heidi Heitkamp (D-N.D.), John Hoeven (R-N.D.), James Inhofe (R-Okla.), and Mary Landrieu (D-La.), sent a letter to President Obama last year urging him to abandon the new regulations. Senator Vitter commented:

The EPA again seeks to advance a political agenda, disregarding the facts and potential economic costs. The price of gasoline at the pump spiked upwards in the last few weeks, and EPA’s Tier 3 proposal – if implemented – could drive prices up even further without explanation.

Despite significant opposition, these costly rules are expected to be finalized in February.