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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