[iroddis]

Probably made worse by the fact that _every_ VW brand car I’ve driven has read about 10% high on the speedometer. I think I’m going 100 kph, but timing using the km markers on the highway show I’m going about 90.

When I talked to the dealers, they said that the speedometers only have to be accurate +/- 10% according to the SAE specifications.

After DieselGate I assumed that the high reading was to game the fuel consumption game.

Never again, VW auto group…

[martinpw]

> When I talked to the dealers, they said that the speedometers only have to be accurate +/- 10% according to the SAE specifications.

I believe the requirement is only one way - they can read high by a certain % but they cannot read low. Which makes sense. But that means in reality they will usually read a little high.

[gene91]

Wow TIL. I have observed that my rental cars in Europe all have faulty speedometer. Multiple brands, multiple countries. So this is why.

[storus]

Just use the speed reported by your GPS. Most navigation apps show the GPS-based speed.

[cuu508]

A little nice thing the cars could do is automatically calibrate the speedometer from GPS when on a long stretch of a road. You would get the accuracy of GPS and the reliability of speedometer even when in city jungle, underground, during slow speed manoeuvres etc.

[jabroni_salad]

I have a GTI and with cruise control on, the speedo and my phone's gps reads exactly the same speed.

[embedding-shape]

I have a Audi A3, speedometer reads ~6km/h too high compared to GPS and various "speed-showing signs" I've driven past.

[mnw21cam]

My 18 year old A3 reads about 1mph higher than the true speed at motorway speeds. It's pretty spot-on, which is very unusual.

[embedding-shape]

Ah, mine is quite precisely 10 years younger, and also European if that matters, sounds like yours might be Mexican if it's in the US unless I'm mistaken. I guess there is some tuning process at the end of fabrication/production, maybe just "wild luck" either way.

[technothrasher]

I believe the only Audi car made in Mexico is the Q5. My US model 2025 A3, btw, is dead on (+/- 1 mph).