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speedo/odo question

830 Views 7 Replies 7 Participants Last post by  jebova2301
According to my searches and from my own first hand experience, the speedometer is off by about 2-3 miles per hour around 60mph. Theoretically if the speedometer is that far off, wouldn't my odometer be off too? Just for my own confirmation I used my own GPS to see if indeed it was and discovered something alarming? Even though the speedometer is off, the odometer seems to be spot on? Truthfully, I'm not worried about my speedometer being off but more worried that my odometer was giving a false reading. Since I decided to sign up for Fuelly, I wanted to make sure I was posting accurate readings. Is it possible for the speedometer to be off but the odometer be pretty accurate?
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I know that my speedo is definitely off which I can live with. When I measured the distance with my GPS I noticed that when my odometer hit 0.5 miles the GPS indicated 1 mile traveled. At first I though, oh great but then noticed at every 0.5, 1.5, 2.5, 3.5, 4.5, 5.5 etc my odometer read, the GPS went up one more mile traveled so I'm assuming as long as both increase at the same point every time, the odometer is calibrated correctly. As long as my odometer is accurate I am happy. I am just worried that if my speedo is off that would throw off my odometer too.
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