Car and truck drivers in seven states have filed a lawsuit against Big Oil alleging that service stations charge more for fuel that’s hotter than the industry standard. The class action lawsuit claims it’s a problem the oil companies are aware of and overcharge consumers by $2b per year.

What may win the suit for consumers is an agreement between regulators that states fuel should be sold at 16 degrees Celsius, reports Reuters. Customers in Florida and Texas suffer from the problem more than other states because of their warm climate. A bill is currently being looked at in Texas that would require fuel companies to cool fuel before it’s sold. We’re no experts, but surely it would be easier adjusting the price of the fuel depending on how warm it is rather than trying to cool oil before it goes in to the vehicle?