Normally, I would say that the speedo would be off by about 2-3 mph (e.g., showing 70 but doing 73). However, checking my H3 on a trip to TN in Sept. and it was traveling at 2 mph under what was shown on the speedo. This was checked on the way to TN with a Garmin GPS, and on the way back by a Magellan GPS.
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Black Sheep Hummer Squadron
(ME TOO)
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