Speedo Reads 3 MPH fast

[aglsteven]

The other option, if you have one or have access to one, is to use GPS unit. That will give you a pretty accurate reading of your true speed. I use it so that I can set my cruise control to as close to the speedlimit tolerance level as possible :-)

The rest of the time, it ensure I don't get a speading ticket, even if I am slightly above the speedlimit. These Aussie cops have nothing else to do than raise revenue through speeding fines. Here in Melbourne the tolerance limit on urban roads is 3km/h. That's 2mph in normal speak - can you believe it!

[deliriousga]

While pulling a DTC code and watching the sensor readings to see what's up, I noticed something. Not something I would normally pay attention to, but I saw this thread earlier today so it sort of stuck out.

The car is idling in neutral, and what do I see? The 4mph safety margin Jim pointed out. The computer says the car is moving at 4mph, but it's sitting in the garage.

No wonder Porsche's look fast even when they're sitting still!! :dance: