Two 2007 Nissan Altima hybrid electric vehicles were used in an accelerated testing program in Arizona where each vehicle was driven for 160,000 miles. Over the course of the testing from September 2007 to September 2009, the two vehicles were driven a total of 323,000 miles and achieved a cumulative average fuel economy of 29.9 miles per gallon. Maintenance logs were kept and posted online documenting repairs and fuel economy on a monthly basis.