Most of the riding we do here in western hills of the Bay Area is hilly, with several 8-10% grades of 4-5 miles available when desired, but what I didn't realize until I got my V100A is how much elevation gain I accumulate even on days I am "avoiding" the steeper climbs - just riding the normal two laners it is almost all in the 75-150ft/mile category and I often come back from an evening ride with 2000-2500 ft. gain on the computer.