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Mine shows exactly 2 MPH higher (always) than my phone’s GPS as well as the roadside speed warning signs that show what speed you’re traveling at. Doing a bit of reading, I found out that that’s how BMW codes the speedometer. The correction can be turned off in older cars to show the exact speed. It should be doable in the G20s too.
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Current:
2020 BMW 330i xDrive
2018 Audi SQ5 Prestige
2017 Audi A7 Prestige
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