Speedometer displays slower than car

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Re: Speedometer displays slower than car

Postby jasonh300 » Sat Nov 10, 2012 6:08 pm

Lonewolf147 wrote:
jasonh300 wrote:Try your Drive A Mile test again. Divot based on mile markers in a different location.



OK, I'll try it again in a few different locations.

Thanks everyone else for the input. 8-)


Oh, that's another point I wanted to make. The mile markers along the U.S. interstates are very inaccurate. I was checking them against my odometer one day and there would be .8 miles and then the next one would be 1.2 miles. They place the signs where it's convenient, so they're not always exactly where they're suppposed to be.
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Re: Speedometer displays slower than car

Postby Lonewolf147 » Sat Nov 10, 2012 5:19 pm

jasonh300 wrote:Try your Drive A Mile test again. Divot based on mile markers in a different location.



OK, I'll try it again in a few different locations.

Thanks everyone else for the input. 8-)
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Re: Speedometer displays slower than car

Postby crazed_out » Sat Nov 10, 2012 5:04 pm

This is true! A speedometer in a car is supposed to show that you're going faster than you really are. As much as up to 10%, but it' very different from make to make. Trucks (lorries) and busses have a speedometer that are much more precise than cars. Hence the reason for you driving and getting a truck or bus up close behing you. In my Volvo the difference is 5 km/h up to about 50 km/h then as much as 10 km/h between 70 and 120, after that I don't know because we're not allowed to go faster in Sweden. 8-)
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Re: Speedometer displays slower than car

Postby OldGnome » Sat Nov 10, 2012 4:15 pm

jasonh300 wrote:Car speedometers generally read high to keep you out of trouble.

This matches my experience exactly. I drive many different cars (I travel a lot for business) and have used a Garmin and now Waze. Whenever I have passed a "you are going this fast" sign, the speed on the Garmin/Waze matches very accurately to the sign. I have also done a driving test and the Garmin/Waze are more accurate than the speedometer.

Some vehicles (especially those with a digital speed readout) have more accurate speedometers than others.

YMMV
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Re: Re: Speedometer displays slower than car

Postby dmcconachie » Tue Nov 13, 2012 6:36 am

Sahirsiddiqui wrote:My experience is that both Waze (& my old Garmin GPS) show speeds almost exactly 10km/hr slower than my actual speed.

"Actual" measured by? If your car then this is normal and waze will actually be closer to your actual speed.

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Re: Re: Speedometer displays slower than car

Postby dmcconachie » Sat Nov 10, 2012 8:11 pm

islupepa wrote:One of the reason for displaying wrong speed could be this conversion bug...http://world.waze.com/forum/viewtopic.p ... conversion

Firstly, it's not displaying the wrong speed. As mentioned above, your car almost definitely overstates the speed.
Secondly that conversion bug creates at most a rounding error. It's only noticeable because it means certain integer values are not displayed. Certainly not enough to be perceptible though!

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