[cfg83]

Hello -

I just did another GPS correction test :

              Car Odometer    GPS       GPS/ODO    % Correction
2007/06/19    19.00           19.6      1.0310     +3.1% (after purchased)
2007/06/19    36.15           37.2      1.0290     +2.9%
2007/12/01    30.40           31.2      1.0263     +2.6% (6 months later)
2007/12/05    31.40           32.3      1.0286     +2.9%
2008/10/08    34.1            35.1      1.0293     +2.9% (16 months later)
2008/10/09    35.6            36.5      1.0253     +2.5%
2009/06/01    29.2            30.0      1.0273     +2.7% (24 months later)
2009/06/01    44.0            45.2      1.0272     +2.7% 
2010/05/07    28.9            29.7      1.0277     +2.7% (35 months later)

I am getting the same results. However, you can see in the above that I am working with 1/10 mile resolution. I watched the GPS click over to 29.7 miles. If the odometer was also about to click over, the result is different :

              Car Odometer    GPS       GPS/ODO    % Correction
2010/05/07    29.0            29.7      1.0241     +2.4% (35 months later)

This implies to me that the tread depth isn't as important as I thought.

QUESTION: Would it be fair to say that "young/deep tread depth" just compresses? It is a form of (synthetic) "rubber", after all.

In any case, me still happy, .

CarloSW2