My '95mtx SHO speedo and odo both read 3-5% under the GPS reading.
This is with OEM sized tires (Michelin Pilots)
regards, Jim White
At Wednesday, 9 August 2006, "Paul L Fisher" <sho@paul-fisher.com>
wrote:
>I've been running with my GPS and my BMW 540i is about 10% under.
Speedo
>says 70, doing 63. My VW Golf is closer to 5% under. Speedo says
70, doing
>67.
>
>It is obvious to me that most car speedometers are off though. I
always do a
>GPS indicated 9.5 MPH over the limit and usually creep by other
cars which I
>assume are doing 10 over on their speedometers.
>
>Paul L Fisher
>
>Visit my website: http://www.paul-fisher.com
>Amsoil dealer: http://www.paul-fisher.com/oil
>
>-----Original Message-----
>From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.
team.net]
>On Behalf Of van Oss
>Sent: Wednesday, August 09, 2006 11:25 AM
>To: shotimes@autox.team.net
>Subject: [Shotimes] Speedo Error... was: My MPG Test is Working!!
>
>It sounds as though speedo inaccuracy is the helpful factor in your
>experiment, George. In a sense you've corrected an error in the
car. That
>by itself would be a postive step.
>
>I've confirmed several times in my 92 SHO that the speedo UNDERstates
actual
>
>speed by exactly 2 MPH. I've noticed the speedo on our Crown Vic
OVERstates
>
>actual speed a lot. The last time my wife followed me on the Interstate,
>she in the Vic and I in the SHO, she really gave me the dickens,
thinking
>we'd been doing 85 MPH in a 70. We'd been doing exactly 75 -- I'd
confirmed
>
>that using the stopwatch function in the dash clock, 10 miles in 8:00
>minutes. My speedo had been showing 73 MPH.
>
>VO
>
>----- Original Message -----
>The speedo conveniently read about 4.5 miles fast from the factory.
..Lexus
>has the largest intentional speedometer error in its class, according
to
>something I read in CU or CR a few years ago....
>
>--
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