exactly... ride at 60mph on the GPS, and note the what the speedo says. Then apply your formula and adjust the speedo healer as necessary. You should be *around* 15% or so.
For the record - don't kill yourself trying to get it perfect cuz you never will. just get it close and call it good. I'd say 1-2 mph at 60 is close enough and better than most cars.
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