fwiw..  ( http://www.bloomberg.com/news/articles/2015-08-24/out-in-the-real-world-oil-market-is-much-better-than-it-looks )

They are filling up on the cheap..  

“The irony is if you just take the oil market data on China, it’s good -- it’s really, really good,” said Horsnell. “If we were running it purely by the micro data, people would be saying: ‘Hey, this isn’t too bad’.”