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Re: GPS as opposed to odometer
My personal thoughts are the OEM Odo and Speedo are very accurate, however are always slightly "conservative" in that they read 1-3 mph optimistic to account for mainly tire OD variations.
While I do realize the GPS is also very accurate, I don't think it "samples" the data as fast as the Odo setup and any transmission time lag (low bandwidth) can be problematic.
I would not worry unless you are getting busted for speeding when all other indications signal that you are in a legal or "safe" range.
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1988 Chevy R-30 1 ton DRW pickup (217k)
1991 Chevy S-10 4WD pickup (192k)
2000 Grand Prix GTP (218k)
2002 GMC Yukon (185k)
2009 G8 - GT (46k)
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