Mine quite frequently tells me I'm climbing a 17% grade when I'm descending and the reverse. Doesn't seem to be any rhyme or reason to it that I can tell (i.e., doesn't only happen in one spot). I don't usually ride with other electronics except a cell in my saddle bag. Who knows....
ETA: For distance, I believe it to be accurate. It's just grade that's so bad for me.



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