Try driving over the continental divide with a 4,000 ft rise followed by a 6,500 ft drop...all that up n down really screwed with my EVIC!!! (about 5 mpg off).
On level ground it's usually within .5 to 1.0, which is close enough to get a good idea of how your doing on fuel mileage.
On level ground it's usually within .5 to 1.0, which is close enough to get a good idea of how your doing on fuel mileage.