Speedometer Off

[Shawn L]

I have noticed that the speedometer seems to be 3 mph off on the low side. So if I am going 70 my speedomter reads 73.



Does this affect the odometer and if so which way?

 

[George C]

Yes, it affects the odometer. It thinks you are puting more miles on than you really are. How did you get the readings exact? I know many speedometers are off a little.



George

 

[OFF TRAC]

huh, mine reads the opposite, if I'm doing 73mph I'll be actually doing 70mph.



Seems to be somewhat of a common issue with the ST of either reading 3+ or - mph.

 

[Shawn L]

In Car GPS

 

[Matthew W]

I have noticed that ford speedometers are off by about 3 mph at 60 mph on several ford vehicles .... when i swapped my 255/70/16 tires for 265/75/16's, i went by several speed trailers (police radar trailers) that my speedo was right on !! I think its so your mileage racks up quicker & gets you out of warranty about 2,000 miles earlier

 

[Thomas Rogers]

Note that on a vehicle the speedometer and odomoter typically are off by the same percentage, but that need not necessarily be so. Depending on the car they might work indepedently.



Here is a link to an article for testing BOTH:

 

[Fudged Undies]

math-you, not to burst your bubble, but don't be too secure in those speed trailers. They often use a very low quality radar detector and more often then not are not properly calibrated.

 

[Kevin Palmer]

Using GPS I found mine was off 3.2 mph at 60 mph. It would read 63, so, I tacked on more miles but didn't get any speeding tickets... LOL