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BMW specs allow for a 10% + 2.4 mph error in this displayed speed. This is actually intentional; if you plug a ScanGauge in, it will show you the true speed.
My '08 with 16" wheels is only 2 mph off, which is much better than my 07 MCS with 17" wheels. It was a full 4 mph off. You learn to adjust.
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'08 Clubman S with JCW Stage 1 including side scuttles and shifter, 100% Astro Black, manual, piano black, anthracite headliner, chrome line, tinted windows and sunroof. It's my stretch limo MINI.
"Continuing to do the right thing for the right reasons."
It's been noted in several other threads. Most people find that it's 3-5mph off when comparing a GPS speed and the indicated speed.
not just several but close to fifty different threads here.
Quote:
Originally Posted by proximal
BMW specs allow for a 10% + 2.4 mph error in this displayed speed. This is actually intentional; if you plug a ScanGauge in, it will show you the true speed.
Actually it is plus 10% +2.4KPH and minus 0% and this is because many of the European nations have this as their Federal Standard.
And believe it or not (and i have tested it) that from a brand new set of 17" tires to a fully used set (down to the wear bars) there will be a 1.2 MPH difference in your speedometer. 16" are about 1.35 MPH and 18" are about 1.07 MPH
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08MCCS, HC/HC/Blk, 6 SPD, Premium, Sport, Cold Weather, Convenience, HiFi, HC L/C - Steering Wheel - Shift Knob-Boot, - E Brake Handle-Boot, English Oak - 17" Web Spoke (R98) Painted H/C, H/C Club Member #42.
