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Bob O · 08-02-2012, 07:53 AM

Based on the readings from my GPS, mine always varies by 5% at all speeds. At an indicated 80 the GPS reads 76, and at an indicated 50 the GPS reads 47-48, etc, etc. I've tracked this over many trips and it never changes. I just live with it. As was posted above, it's apparently a law in Europe and the fines for having the speedo read slow are, from what was discussed in a previous thread, pretty substantial. It's not that big a deal to me. If you can figure out what the factor is to correct for the error (assuming it stays constant, which it does on mine) it becomes pretty automatic when on the road.

08-02-2012, 07:53 AM	#18
Bob O Registered User Join Date: Aug 2005 Location: Kansas City Posts: 319	Based on the readings from my GPS, mine always varies by 5% at all speeds. At an indicated 80 the GPS reads 76, and at an indicated 50 the GPS reads 47-48, etc, etc. I've tracked this over many trips and it never changes. I just live with it. As was posted above, it's apparently a law in Europe and the fines for having the speedo read slow are, from what was discussed in a previous thread, pretty substantial. It's not that big a deal to me. If you can figure out what the factor is to correct for the error (assuming it stays constant, which it does on mine) it becomes pretty automatic when on the road. __________________ 79 911SC Targa.. gone but not forgotten 2001 Boxster Black/Savanah Beige RoW M030 suspension 7/15 mm spacers Deambered Desnorked SS door sills Debadged Clear tails Technobrace Technobra I'll never own another black car!