MythBusters Season 8 Episode 12 (MythBusters s08e12) with title “Car Conundrum” airs on Wednesday, June 23rd 2010 at 09:00 pm via Discovery Network.
Here is summary for MythBusters Season 8 Episode 12 :

Three popular car myths are put to the test.

Few hours after original series aired on TV, online streaming video for MythBusters Season 8 Episode 12 usually available on Net and of course, if video available, as soon as possible will show you where you can watch this episode for free.