I'd have to look this up, but I'd bet that jet fuel and diesel make up a larger share of petroleum use than gasoline. And don't forget the plastics industry. I doubt increasing the numbers of electric cars will have a huge effect on crude oil prices or demand.
I'm pretty sure transportation demand is a huge percentage of petroleum production. I had a college prof who argued that oil and gas were too valuable to be used for transportation because things like fertilizer, pharmaceuticals, and clothing were better uses.
