I live in the Mile High City (Denver). Here at my house I live at around 5,400' in elevation (1.65km for you @Hadleys Taxi). This weekend I took the HRV up to a hike that started at 9,700' (2.95km), and back down. Going up, a respectable 26.3mpg. Coming back down, 58.6mpg. This is over a 25 mile drive.