What would happen if California imposed a brand new tax on a barrel of oil? According the supporters of Proposition 87, an energy initiative on November's ballot, it would feel good. After all, oil is to blame for a lot of problems. Even with prices dipping down lately, it still costs a small fortune to fill your gas tank, it probably came from an unfriendly foreign country, and it's bad for the environment. But aside from its therapeutic benefits, what impact would this initiative really have?