Another damned class action suit that benefits the shyster bastards that ginned it up, and no one else.
Different jurisdictions and different vendors have addressed this issue differently. Some just paste an advisory label on the pump. Some have compensators that adjust the indicated dispensed volume to what it would be at a standard reference temperature. (If the fuel is very cold, this indicated dispensed volume will be more, not less, than what was physically delivered.) It is a valid question; why it needed a lawsuit to resolve it I do not know. Maybe it was believed adequate that on average throughout the year, more fuel was dispensed than was charged for, even though on a given (hot) day, less might be.