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Originally posted by SilverX@May 11 2005, 09:48 PM
I thought companies did it on purpose so people would drive slightly below speed limit.
But wouldn't they want to make the reading higher than your actual speed, so you think you're speeding when you're not? Maybe I misinterpreted the first post, but it seems like it's the other way around...
 

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^^^That's how I read it too.
 

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We had couple of posts about it. I used several GPS receivers and came to a conclusion that tC, as well as many other toyotas on stock size tires read 2mph above your actual speed, as in the speedo showing 60, you are going 58. Doesn't bother me. Keeps me 2mph away from a ticket.
 

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Oh...so from your experience, your actual speed is less than what you're reading? I'm just a little confused, b/c the first post says that your actual speed is above what you're reading...
 

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Wheel size matters. And that's what my GPS says and several others that were in my car and my friend's Toyotas.
 

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well you can check it easly if are driving on the street and you see one of those police radars on the side of the street, which shows how fast you are going you will see teh diference. It's always between 2-3 miles off. Thats why i drive 8-10 over speed limit. If i get a ticket it would be for 6-8, in that case i could easily get dismisted in court.
 

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Actually the best way to do it is to use milemarkers and a stop watch over about 10 miles. Speedos are allowed +/- 3% accuracy, so most mfrs indicate more than your actual speed to keep you out of trouble. The only car I've ever owned that had the correct speed indication from the factory was my Supra. It is dead on accurate. All the rest have indicated high.
 

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Originally posted by ScionGTR@May 12 2005, 12:46 AM
well you can check it easly if are driving on the street and you see one of those police radars on the side of the street, which shows how fast you are going you will see teh diference. It's always between 2-3 miles off. Thats why i drive 8-10 over speed limit. If i get a ticket it would be for 6-8, in that case i could easily get dismisted in court.
There was one in my neighborhood, I went at 16mph and the reading displayed 13mph.
 

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Those portable ones you see on the side of the road are fun to play with, I drove by one a couple weeks ago it said i was doing 35, later on that day when I knew I would be driving by it again I tried to see how high I could get the numbers to go, I was doing 110
 
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