The CIA World Factbook gives estimates on each country's oil consumption, production and proven reserves.
Here's what they say about Saudi Arabia:
Oil - production:
8.711 million bbl/day (2001 est.)
Oil - consumption:
1.452 million bbl/day (2001 est.)
Oil - proved reserves:
261.7 billion bbl
...and the USA:
Oil - production:
8.054 million bbl/day (2001 est.)
Oil - consumption:
19.65 million bbl/day (2001 est.)
Oil - proved reserves:
22.45 billion bbl
...and China:
Oil - production:
3.3 million bbl/day (2001 est.)
Oil - consumption:
4.975 million bbl/day (2001 est.)
Oil - proved reserves:
26.75 billion bbl (37257)