wrong road speed

**davecj** · 10th December 2012, 22:15

is the average road speed determind using abs sensor or gearbox sensor on signum2.2 direct this car is killin me help

**mon** · 11th December 2012, 05:58

It's normally done on the gearbox sensor

**Yugguy** · 11th December 2012, 08:48

How bad is it? All speedos overread to some extent.

**Derek Mc** · 11th December 2012, 09:16

An error of 5% is common on a speedo. Are you referring to the OBC average reading or the speedo? your obc will probably be saying somewhere from 27 to 40mph depending on the length since a reset?

**Ziggy** · 11th December 2012, 10:20

Originally Posted by Derek Mc

An error of 5% is common on a speedo. Are you referring to the OBC average reading or the speedo? your obc will probably be saying somewhere from 27 to 40mph depending on the length since a reset?

My says 16

It matches my MPG perfectly

**Derek Mc** · 11th December 2012, 11:15

Originally Posted by Ziggy

My says 16

It matches my MPG perfectly

My average speed is 38mph my average economy 51.4mpg the economy is about 3mpg less than a brim to brim fill up the average speed however is painfully accurate due to congestion. I have never really managed a long term average speed over about 45mph consistantly