How's speedo accuracy?

[Paulie68]

Hi all, just musing whilst I wait for my car to arrive. How's the speedometer for accuracy on the MG5? Our current LEAF always over reads by 10% by design!

 

[Verdigris]

Very accurate IME.

 

[Pebblefeline]

Spot on accurate, does not appear to give 10 percent ish as normal

Agrees with my gps speedo exactly

 

[5teep]

Yes accurate, they kind of have to be when you have cruise control I reckon.

 

[Paulie68]

Yes accurate, they kind have to be when you have cruise control I reckon.

The LEAF cruise control would dispute this though as it's still 10% over reading when set!

 

[smokie]

Hi all, just musing whilst I wait for my car to arrive. How's the speedometer for accuracy on the MG5? Our current LEAF always over reads by 10% by design!

Compared to...?

 

[Paulie68]

Compared to...?

Actual speed of travel, as checked by GPS.

 

[Pebblefeline]

This is the first car I have ever had that doesn’t over read on the speedo vs actual

 

[Paulie68]

This is the first car I have ever had that doesn’t over read on the speedo vs actual

My Tesla Model S and MG ZS EV were both almost exactly right as well, all other cars I've ever owned over read by at least 5%. The LEAF has been, by far, the most out!

 

[Verdigris]

My speedo always agrees with road-side speed monitors.

 

[decrep]

First thing I do with a new car is check speedo accuracy. Most overread by 5% to 8%. But our MG4 is spot on. wouldn't surprise me if it's taken from its GPS instead of the wheels.

 

[EVsince2016]

My LEAF read 10% faster, the MG5 is bang on.

 

[MickeySw]

wouldn't surprise me if it's taken from its GPS instead of the wheels.

That thought crossed my mind but that would require satellite cover at all times which can be problematic, i.e. driving through a tunnel

 

[Alb]

I find a slight over-read (no more than a couple of mph).

 

[decrep]

That thought crossed my mind but that would require satellite cover at all times which can be problematic, i.e. driving through a tunnel

Agree, but it probably wouldn't require much coding to have the wheel output calibrated by the GPS. It would only have to keep track of tire wear.

 

[omega22]

I find the pre-facelift MG5 spot on.

 

[Bobby2303]

Hi all, just musing whilst I wait for my car to arrive. How's the speedometer for accuracy on the MG5? Our current LEAF always over reads by 10% by design!

It is spot on!

 

[Funks]

As a ex vehicle designer who worked for a manufacturer, I can confirm that the "old" type or traditional speedos were calibrated at road speed +%5. The reasoning and thoughts behind this were to minimise legal liability when the driver was prosecuted for speeding.
With the introduction of electronic and/or digital vehicle instrumentation some manufacturers continued with the +5% calibration "just to be on the safe side". (My VW speedo indicated high compared to my GPS).
However, my MG4 speedo reads "true road speed", and corresponds to within +/- 1 digit of my GPS and TomTom sat nav.

 

[Paulie68]

As a ex vehicle designer who worked for a manufacturer, I can confirm that the "old" type or traditional speedos were calibrated at road speed +%5. The reasoning and thoughts behind this were to minimise legal liability when the driver was prosecuted for speeding.
With the introduction of electronic and/or digital vehicle instrumentation some manufacturers continued with the +5% calibration "just to be on the safe side". (My VW speedo indicated high compared to my GPS).
However, my MG4 speedo reads "true road speed", and corresponds to within +/- 1 digit of my GPS and TomTom sat nav.

I think Nissan used a 10% over read on the LEAF on purpose to give the impression you were getting a better range than it could really do, especially the first 24kWh version. If you drove at a shown 70 mph for example, the miles per kWh would be very good for driving at the motorway limit! (As they should be as you're only doing 63!)

 

[GlobalHealer69]

First thing I do with a new car is check speedo accuracy. Most overread by 5% to 8%. But our MG4 is spot on. wouldn't surprise me if it's taken from its GPS instead of the wheels.

Mine too ( according to Police radar that is ).