Originally Posted by bikenh

Very interesting comparison. I was guessing at the time 20-25% grade. I knew it was way over 18% as I've ridden Mt. Ascutney in VT twice and it has an extended stretch of 18% and averages just under 12%. I know what 18% looks like as I drive up the road several times a year helping out the hang glider pilots around the area. That's why I was shocked to see it rwgps come up with such a low % being shown for Tanglewood Drive. I'm not used to looking up a stretch of road like that...LMAO

Generally it doesn't really matter but when you run into instances where your going to hit big % grades climbs it can make the difference...like a couple of other people have stated. It gets worse when you think you don't have much of a climb but you come to find out in reality that you do because the map data is incorrect. I would have guessed the map data would have been the same between websites and the interface was set up differently between them. I thought they all dropped back to using Google maps.