The legislation is "the only energy bill out there" that can pass Congress, Sullivan said in an interview.
As evidence of its broad appeal, backers point to support from both President Barack Obama and Representative Ron Paul, a Texas Republican and Tea Party favorite.
"These credits reduce taxes for the production or purchase of vehicles that run on American-made natural gas," Paul said in a statement released June 27. "These credits are not subsidies."
Obama called similar legislation to provide incentives for the purchase of natural gas vehicles "a big deal" in a March 30 speech at Georgetown University.
"Congress cannot manage but one bill at a time," Pickens said on Bloomberg TV, predicting anew that the Nat Gas Act will pass this year. "So you're either hung up on health care or you're hung up on the debt or you're hung up on the budget."
The bill is H.R. 1380.