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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.
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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!
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