Hi Tuffy,
Hopefully we're not too late!
It's difficult to say for sure, but you should be looking at around 115 on average, but having said that, it can vary massively, so just use that as a very rough guide.
Hope this helps
Jim

x2
its not odd to see readings like 145 either. and down to 105. Just as long as its in that kind of range on a golf.
If your looking at readings of 180- and above id say thats its likely the car has had a re-paint