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I think he just used the wrong word - that they are 10% high, ie looks 100km/h, is 90km/h... vs SAABs that maybe look 100km/h are 95km/h or whatever. Though really, mileage is tracked through the odometer, but again, if it says you traveled more than you really did you get a higher mpg...
That said, wheels can make as much as +/- 4% difference depending on variations in tire choice (usually a few reasonable sizes), etc. I have a 2004 arc running 225/45R17 (205/55R16 winter is the same diameter), but stock was 215/55R16 which is a few % off... I believe you can update this with a Tech2, but I have not done so. I suspect my mpg and speedo readings are off as a result.
I'm not sure why it would be a big deal to show the speed too low as long as it was not extreme. I get it from the perspective of policing, but due to tolerances in tires, radar guns, calibrations, etc, they have to leave a little margin anyway. I know some places in the world ticket if you are 1mph over, but imho, that is a ridiculous waste of time, and probably reduces safety if everyone spends too much time watching their speedo! Eye time is valuable when driving and that one should be a small fraction of it!
Posts in this Thread:
- VW Emission Scandal, EGD
, Tue, 22 Sep 2015 10:09:52- Re: VW Emission Scandal - link to some details, used2bcheaptech, Fri, 25 Sep 2015 11:48:35
- Re: VW Emission Scandal, BobS, Thu, 24 Sep 2015 15:59:10
- Kudos to the EPA and CARB, Janik, Thu, 24 Sep 2015 13:56:35
- I'm not surprised, AdamB
, Wed, 23 Sep 2015 07:54:50 - Engine Reliability After Recall, Tim, Wed, 23 Sep 2015 02:02:10
- Will probably be a fire sale on used Jetta TDI Wagons, Bill Homer
, Tue, 22 Sep 2015 14:29:01 - Re: VW Emission Scandal, Nick Taliaferro
, Tue, 22 Sep 2015 11:36:22- Test modes are allowed, but, steve, Tue, 22 Sep 2015 13:50:27
- Not completly convinced..., Cary, Tue, 22 Sep 2015 14:51:17
- Re: Not completly convinced..., Mike Johnson, Wed, 23 Sep 2015 12:37:57
- No need to speculate anymore, ryan
, Wed, 23 Sep 2015 10:16:40 - Retrofit could cost $3,000 per car., Norm9-5, Wed, 23 Sep 2015 08:06:16
- Re: VW Emission Scandal, Craig, Tue, 22 Sep 2015 10:42:22
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