Anytime there is a discussion on speed, there is goody two shoes who drives 5 mph under the limit in the passing lane and won't let traffic by and will rant and rave about people shouldn't be in a hurry. I agree with I2ridehd that 10% plus is reasonable in good weather conditions. Two or three mph + or - can be contributed to police radar or laser error, speedometer error, or a combination of both. If you have a cart that will go exactly 19.9 mph and think anything over at all should be given a ticket, then you will get one when you have a 15 to 20 mph tail wind. I have a speedometer on mine that reads to .1 mph and can see the difference heading into the wind and away from the wind, not to mention up or down hill.
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Les
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