The pilot flew nine skydiving flights on the day of the accident in the Cessna 182A. Each flight was approximately 30 minutes in duration. The airplane was refueled after approximately every other flight with about 12 gallons of fuel. Prior to takeoff for the tenth and final flight of the day, the pilot thought he had about 16 gallons of fuel in the airplane; however, he did not visually confirm how much fuel was in the tanks and could not remember what the fuel gauges indicated.