![Quote](https://www.vwwatercooled.com.au/forums/images/misc/quote_icon.png)
Originally Posted by
bobski
If cars are up to 10km/h out at an indicated 100km/h, then the km travelled would also be out and their fuel economy calculation would follow (my ute is 6km/h out which got me thinking about it)? Is that right?
![Quote](https://www.vwwatercooled.com.au/forums/images/misc/quote_icon.png)
Originally Posted by
GTR27
Typically odometers are dead accurate, but speedos can be out by up to 10%
When my speedometer was 10% out the odometer was 5% out. eg: the 15,000km service came due at a genuine 14250km. It doesn't sound like much but if I'd continued with 205/55r16 tyres my current 165,000km on the odometer would have only taken 156,750km to achieve.
I ran oversized tyres from about 50,000km to 150,000km and have probably evened things out by now.
Bobski is right, my "apparent" fuel consumption got worse when I was running oversized tyres despite my RPM on the highway being slightly less.
carandimage The place where Off-Topic is On-Topic
I used to think I was anal-retentive until I started getting involved in car forums
Bookmarks