I've noticed people regularly talking about how your (analog) speedo registers higher than your actual speed - why is this anyway?
The 350z also has a digital speedo as one of the options on the display which registers a few mph less than the analog one, so I thought that was correct. But yesterday, driving back from Devon I had my Tomtom Sat Nav on and it was different again!
For an example, the analog speedo would say 75, the digital 72 and the Sat Nav 70
So....which is the most accurate....and what speed am I doing?
The 350z also has a digital speedo as one of the options on the display which registers a few mph less than the analog one, so I thought that was correct. But yesterday, driving back from Devon I had my Tomtom Sat Nav on and it was different again!

For an example, the analog speedo would say 75, the digital 72 and the Sat Nav 70
So....which is the most accurate....and what speed am I doing?
