By Timothy Gardner, David Shepardson and Liz Hampton WASHINGTON (Reuters) -Oil executives defended themselves in the U.S. Congress on Wednesday from charges by lawmakers that they are gouging Americans with high fuel prices, saying that they are boosting energy output and no one company sets the price of gasoline. Lawmakers in the U.S. House of Representatives Energy and Commerce Subcommittee on Oversight and Investigations are holding the hearing to grill companies on why gasoline prices remain elevated even though prices for crude oil, the feedstock for fuels, have dropped. U.S. gasoline pri…