Ford on Tuesday extended most of its incentive offers on Ford-branded vehicles until September 30 and enhanced deals on five models, Reuters reported. The news agency said Ford's incentives - including its Lincoln and Mercury brands - averaged $US3,687 per vehicle in July, a 5.8% increase from June yet, despite that increase, Ford's sales fell 11.5%, due to lower fleet sales, weak car sales and the change over to a new version of the F-150 pickup truck.