William,

I monitor my gas mileage regularly and without knowing my speedometer error,
and my odometer error as a result, my figures would be skewed from actual
mileage.  While 3% error does not sound like much, monkeys share 97% or our
DNA and you see what difference that makes. :-)

I am not implying that 3% speedometer error will turn anyone into a primate!

Chris.

----- Original Message -----
From: "developtrust" <developtrust@HOME.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Monday, February 18, 2002 10:42 PM
Subject: Re: right sized tires, wrong speed indication

> What is the big deal about MPH being not accurate with different tires. Is
> there a police following you ready to give a ticket? Is it really that
> important to be so accurate? Does 3 to 4 miles per hour really matter that
> much.
>
> Please enlighten me as to why it is so important.
>
> William Polowniak
> 1989 Vanagon GL
> 1988 Mercedes 300 SE
>
> Subject: Re: right sized tires, wrong speed indication
>
>
> > At 10:22 PM 2/18/2002, Bradley Flubacher wrote:
> > >My '84 westy cruises nicely at 75-80 MPH, according to the speedometer.
> > >It's got to be wrong. I suspect by about 10-15 MPH.  Any suggestions?
My
> > >tires are the correct size..
> >
> > So does mine...why has it got to be wrong?  Do some times on mile
markers
> > and see.  Actually my speedo reads almost exact at 70 with 205/70-14
> > tires.  With the 185/75?-14 it was maybe 3-4 mph high at 70.  The '84s
had
> > a much larger tolerance on the speedo calibration than later ones, but I
> > think what I described is typical, i.e. the speedo is set up for 805
turns
> > per mile and the 185 tires do more than that.  But not 10-15 mph more.
> >
> > david
> >
> >
> > --
> > David Beierl - Providence, RI
> >   http://pws.prserv.net/synergy/Vanagon/
> > '84 Westy "Dutiful Passage"
> > '85 GL "Poor Relation"
>