Originally Posted by tarwheel

Where do you people get your elevation data? I've got a GPS tracker (Cyclemeter) on my iPhone but the elevation data are essentially worthless. Eg, on four different days commuting the same route and distance to work, it showed elevation gains of 1170, 4000, 1945 and 1534 feet. Even if I throw out the outlier (4000), that would average out to about 1500 feet of climbing one way, which would mean a roundtrip elevation gain of 3000 feet over 30 miles. I doubt it. My route is hilly but I don't think it has that much climbing.