According to the pilot, the airplane encountered a tailwind gust during landing. He reported that he frequented the airport and it was common practice to land with a tailwind because of the preferred upsloping runway. He asserted that he underestimated the significance of the wind conditions, and that when the airplane touched down, it was too late to abort the landing. The airplane's ground speed was too fast, and the airplane exited the departure end of the runway and collided with an embankment. The airplane sustained substantial damage to the left-wing. The METAR at the nearest airport was 2 nautical miles from the accident site and reported that about the time of the accident the wind was from 160° at 17 knots and gusting to 24 knots. The pilot landed on runway 30. The pilot reported that there were no mechanical malfunctions or failures with the airplane that would have precluded normal operation.