<div style="FONT-FAMILY: Times New Roman; COLOR: rgb(0,0,0); FONT-SIZE: 16px"><DIV><SPAN style="FONT-SIZE: 12px; FONT-FAMILY: arial; COLOR: #000000">&nbsp;</DIV><BR>From: <SPAN class=misspelled>ddbjorkman</SPAN>@<SPAN class=misspelled>verizon</SPAN>.net<BR>Date: May 7, 2013 8:54:28 AM<BR>Subject: Re: Re: <SPAN class=misspelled>speedometer</SPAN> accuracy<BR>To: bike2vcu@YAHOO.COM<BR></SPAN>&nbsp;<BR><DIV style="FONT-SIZE: 16px; FONT-FAMILY: Times New Roman; COLOR: rgb(0,0,0)"><DIV>Before you go blaming the <SPAN class=misspelled>speedo</SPAN> (which is well documented as being off)&nbsp;and take the GPS as the final word. do not forget that there is an error in accuracy in your GPS also.&nbsp;&nbsp;There should be a place you can check which satellites are being used&nbsp;by your GPS&nbsp;and the expected accuracy.&nbsp; One may be surprised to find that that error can be more than just a few feet.</DIV><DIV>BTW, by using my GPS. I found that the error in accuracy in my <SPAN class=misspelled>speedo</SPAN> seems to increase as I increase my speed beyond <SPAN class=misspelled>approx</SPAN>.. 70 MPH.&nbsp; Seems to be more than just the ratio thing.</DIV><DIV>&nbsp;</DIV><DIV><SPAN class=misspelled>Dave</SPAN> B.</DIV><DIV>&nbsp;</DIV><DIV>&nbsp;</DIV><DIV>&nbsp;</DIV><DIV style="BORDER-TOP: #bcbcbc 1px solid; MARGIN: 5px 0px"></DIV><SPAN style="FONT-SIZE: 12px; FONT-FAMILY: arial; COLOR: #000000">On 05/06/13, <SPAN><SPAN class=misspelled>Stephen</SPAN> <SPAN class=misspelled>Grisanti</SPAN></SPAN> wrote:</SPAN><DIV>&nbsp;</DIV><DIV style="FONT-SIZE: 12px; FONT-FAMILY: arial; COLOR: #000000">Stock tire size on my '87 was revealed to be reading slow when we borrowed "<SPAN class=misspelled>Samantha</SPAN>" the GPS from <SPAN class=misspelled>neighbors</SPAN> for a trip. &nbsp;In addition to reminding us about all the turns we'd missed she informed us that at an indicated 65 we are really doing about 58. &nbsp;Here I thought everyone else was really hauling and it turns out I'm the one who is not.<BR><SPAN class=misspelled>Stephen</SPAN><BR><BR>--- On <SPAN class=misspelled>Mon</SPAN>, 5/6/13, <SPAN class=misspelled>Mike</SPAN> Miller <A class=parsedEmailparsedEmail href="mailto:mwmiller6@ATT.NET" target=_blank>mwmiller6@ATT.NET</A>&gt; wrote:<BR><BR>From: <SPAN class=misspelled>Mike</SPAN> Miller <A class=parsedEmailparsedEmail href="mailto:mwmiller6@ATT.NET" target=_blank>mwmiller6@ATT.NET</A>&gt;<BR>Subject: Re: <SPAN class=misspelled>speedometer</SPAN> accuracy<BR>To: <A class=parsedEmailparsedEmail href="mailto:vanagon@GERRY.VANAGON.COM" target=_blank><SPAN class=misspelled>vanagon</SPAN>@GERRY.VANAGON.COM</A><BR>Date: Monday, May 6, 2013, 4:54 PM<BR><BR>I'm interested too. I've put 225/75-15 <SPAN class=misspelled>BFGs</SPAN> on and my <SPAN class=misspelled>speedometer</SPAN> is off,<BR>according to my GPS, by more than the percentage the difference in size between<BR>that and stock predict. I thought the stock VW <SPAN class=misspelled>speedometers</SPAN> were off but on the<BR>high side as <SPAN class=misspelled>Karl</SPAN> indicated, but the percentage is greater, meaning the stock<BR>was reading too slow?<BR><BR>Also I have a scan gauge and it indicates about 100 RPM less than the <SPAN class=misspelled>diesel</SPAN><BR><SPAN class=misspelled>tach</SPAN> <SPAN class=misspelled>idicates</SPAN>? Which is likely to be more correct and how does each determine<BR>RPM?<BR><BR><SPAN class=misspelled>Mike</SPAN> in <SPAN class=misspelled>Cotati</SPAN><BR><BR><BR><BR><BR>________________________________<BR>From: <SPAN class=misspelled>Karl</SPAN> <SPAN class=misspelled>Ploessl</SPAN> <A class=parsedEmailparsedEmail href="mailto:karl.ploessl@GMAIL.COM" target=_blank><SPAN class=misspelled>karl</SPAN>.<SPAN class=misspelled>ploessl</SPAN>@GMAIL.COM</A>&gt;<BR>To: <A class=parsedEmailparsedEmail href="mailto:vanagon@GERRY.VANAGON.COM" target=_blank><SPAN class=misspelled>vanagon</SPAN>@GERRY.VANAGON.COM</A><BR>Sent: <SPAN class=misspelled>Mon</SPAN>, May 6, 2013 1:29:08 PM<BR>Subject: <SPAN class=misspelled>speedometer</SPAN> accuracy<BR><BR>so I finally got a GPS in my van. And what do I notice?<BR><SPAN class=misspelled>Speedometer</SPAN> says 60 <SPAN class=misspelled>mph</SPAN> and GPS says 45 <SPAN class=misspelled>mph</SPAN>! At 70 (<SPAN class=misspelled>speedometer</SPAN>) the GPS<BR>says 62!<BR>I am running <SPAN class=misspelled>Michelin</SPAN> <SPAN class=misspelled>Agilis</SPAN> 61 in size 185/14 C and it is a <SPAN class=misspelled>Westy</SPAN> 81<BR><SPAN class=misspelled>aircooled</SPAN>. And it is in Delaware to satisfy <SPAN class=misspelled>Scott</SPAN>.<BR>The question I have: does this discrepancy also affect the <SPAN class=misspelled>odometer</SPAN>?<BR><BR>------<BR><SPAN class=misspelled>Karl</SPAN><BR>1981 <SPAN class=misspelled>Westy</SPAN> "Jenny"<BR>2000 VW <SPAN class=misspelled>Jetta</SPAN> GLS VR6<BR><SPAN class=misspelled>Wilmington</SPAN>, DE<BR></DIV></DIV><BR></div>