The critical exchange between oil companies and auto companies about who is at fault for the energy crisis. In one ad that ran last year, Chevron argued that "if automakers improved fuel economy across the board by just 5 mpg, we'd save over 22 billion gallons of gasoline a year." The criticism is also sparked by the high price of oil which is hurting sales of pickups and large SUV's that the automakers depend on for profits. One ad by Exxon Mobil shows a cartoon of a large SUV filling up at a gas station and hints that the problem rests with the automakers who have failed to build the kind of highly fuel efficient vehicles that are needed. The ad says that the average fuel economy of new U.S. autos has not gone up much in two decades, the small gains have been offset by the increases in the size and weight of vehicles.