LONDON, England - The inaugural American F1 GP scheduled for New Jersey in 2013 has been postponed for a year, according to Formula 1 chief executive Bernie Ecclestone.The race was due to take place on June 16 but has been re-scheduled to 2014, according to a report in the Jersey Journal.The postponement is due to rising doubts about progress being made in preparation for the event.'WE'RE SATISFIED'Bernie Ecclestone told Eurosport: "It is not going to happen next year (2013). If they came up with the contract with us and we were satisfied the question is could they carry out the work in six months? Winter in New York is not good."Ecclestone said there is now an empty slot in the 2013 proposed 20-race calendar - but Bernie is know for his ability to change his mind.