Trucking oil

Here are some recent facts published about ISIS. They are selling oil at a 50% discount. They are earning 3 million dollars per day selling this oil. Do the math. If oil is currently selling at $100 per barrel, they are selling theirs at $50 per barrel they are selling 60,000 barrels per day. They are trucking this oil to Turkey and each truck holds 10,000 gallons or 250 barrels so they are shipping 240 trucks per day. That is a 100 mile journey across open desert. I have not heard of any trucks being targeted by the US Air Force which is flying over Iraq on a daily basis.