The quickest way to half the cost of oil is to use half as much. Lose the big car, insulate your house. Get a heat pump. Car pool.
Of course Joe Blogs can't negotiate with Saudi Aramco, but he can stop feeding demand into the system.
Reminds me of what Mexicans say about cocaine, heroine and marijuana-toking Americans. ... all progress depends on the unreasonable mensch.(apologies to G.B. Shaw)