My wife has driven her new 2014 Prius v (she bought it brand new in September) for 250 miles. Her tank was half empty (dealer filled it when she bought it). I was surprised to see 42mpg! Her driving was mix of freeway and city streets. She was driving Nissan Juke before and it gave her 19-22mpg using 91 octane. True, Prius v doesn't have the power of Juke but for day to day driving it provides sufficient power. but 42mpg??? It is smply amazing.