[Vwdiesel] accuracy of speedo/odometer/avg fuel economy and othertidbits

[pmdolan1 at sasktel.net]

3-5% speedo error will NOT correct with tire wear, not even close.  I 
can't remember what the allowable tolerance is, but for some reason +/- 
2% sticks in my mind. 
 
It doesn't matter what engine, emission hardware, etc. is on a VW or 
Audi, it was a coding that allowed it to recognize a drive test and 
make it all work for the time until end of test.  The hardware and 
MOST of the software would be just fine, until you just drive the car 
normally.  No idea what they gained (I expect either driveability 
and/or economy) by cheating. 
 
Also: don't think for one minute that VW is the only company gaming the EPA. 
 
Pat

On Thu, 24 Sep 2015 09:25:12 -0500, Hayden Chasteen  wrote:

       Ever since I purchased my 2015 Jetta TDI, I have puzzled over 
the apparent inaccuracy of the speedo/odometer and especially the AVG 
MPG display. Unlike my Grand Cherokee Ecodiesel, which is extremely 
accurate (by road test, GPS and math calculations) the Jetta is about 
9.2% off. Speedo over estimates speed by 3-5 mph. Odometer has about 
the same error and the avg MPG is also overstated by the same 9+%. So 
finally, I made an appointment to take the car to the dealer. I spoke 
today with the head tech and explained my concerns. His response was 
very interesting: “If you want an accurate speedo and the other 
things, buy a Phaeton or a CC!” He said that the accuracy will change 
as the tires wear and “everything will average out”. He said VW 
aims for accuracy at ½ tire wear! Point is, don’t assume your gauges 
are correct, particularly the AVG MPG. I also asked about the recall 
and we all couldn’t understand why the 2015/16 cars were included in 
the holdback/recall since they have a completely different engine, 
emissions system and software from the previous models (09-14). Their 
response was “you know as much as we do right now! We are getting our 
information from the news also.” Just thought this was important 
enough to pass along. Hayden

"God is not a diviner being or a magician, but the creator who brought 
everything to life. Evolution in nature is not inconsistent with the 
notion of creation, because evolution requires the creation of things 
that evolve.” Pope Pius XII
“There are many men of principle in both parties in America, but 
there is no party of principle.”
“I do not know if the people of the United States would vote for 
superior men if they ran for office, but there can be no doubt that 
such men do not run."
“I cannot help fearing that men may reach a point where they look on 
every new theory as a danger, every innovation as a toilsome trouble, 
every social advance as a first step toward revolution, and that they 
may absolutely refuse to move at all.” Alexis de Tocqueville

Proud owner of:
2014 Jeep Grand Cherokee Ecodiesel
1968 Beetle
2015 Jetta SE TDI
And many, many, many VWs; from a 1947 Beetle (13 Beetles total), to 
Vans (5 - 3 splitties 2 bay window (both were campers), 1 Vanagon 
Westy, Rabbits (3), Karmen Ghia (1), Jettas (11), Passats (2), Dasher 
(1), New Beetle (1), Rabbit Convertible (1) and Rabbit Pickups (3) most 
now gone but not forgotten. 

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