On the show "MythBusters", drafting behind an 18-wheeler truck was tested and results showed that traveling behind the truck increased overall mpg efficiency by 11%. Traveling behind the truck produced a 39% gain in efficiency. Additionally, on the same episode, Mythbusters demonstrated that it can be very dangerous for the following car if one of the truck's tires (or their recaps) delaminate, as the chunks of ejected rubber can be large enough to cause serious harm, even death, to a driver following too closely.