Answer to this week's riddle

Travis Hale

Again, the riddle:

What was (most likely) the U.S.'s top-grossing export in 2011?

Answer: Fuel (gasoline, jet fuel, etc.).
Source:
http://www.washingtonpost.com/business/big-shift-for-gas-guzzling-nation-fuels-are-top-us-export-oil-imports-still-worlds-highest/2011/12/30/gIQAw0A5QP_story.html?tid=sm_twitter_washingtonpost&tid=sm_twitter_washingtonpost