"People are paying for gasoline they're not getting," said Rep. Dennis J. Kucinich, D-Ohio, who conducted a congressional hearing on the issue Friday.
Lawmakers and consumer groups accuse oil companies and gas station owners of cheating customers by not dropping the price of gasoline during warmer temperatures.
Consumer groups, truckers and others want gas stations to install devices that would end the inequity of "hot fuel" by automatically adjusting volume according to the temperature at the pump.
"You're not getting a real gallon when it's hot," said John Telles, a Pinole, Calif., trucker who has joined one of several lawsuits filed against fuel retailers over "hot fuel" prices.
2014: The Year in Music [PHOTOS]