But any extra Saudi oil released now will be too late in arriving and too heavy a grade to keep America's drivers happy.

ECONOMIST: Other reasons to worry

Nothing that would make the tablet uncomfortable to use, but enough to remind you there's a heavy-duty, laptop-grade processor inside.

ENGADGET: Microsoft Surface Pro hands-on Hands-on

Much of Venezuelan oil is also heavy oil, which is a lower grade.

FORBES: China Gets Chummy With Chavez, You Should Buy Oil