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    Thread: Speedometer / odometer accuracy

    1. Junior Member
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      10-04-2010 07:08 PM #1
      So, here is a new thing I discovered on my CC.
      This weekend I took my first longer trip in my new CC - from Long Island to Baltimore, and back. I do this trip about once every five weeks, visiting family.
      I always follow the same route, and I know that the trip is about 450 miles, round trip - door to door.
      Yesterday, when I arrived home, my odometer showed 475 miles. That's about 5% more. Interestingly, the speedometer, when compared with my Garmin GPS, shows about 5% faster speeds, too. That would explain the "extra" mileage on the odometer (If the speedometer says you are traveling at 80 mph, for one hour, then the odometer will show 80 miles traveled for that hour. But if your ACTUAL distance travelled is only 75 miles, then you incurr a 5 mile "penalty" on the odometer) While this may seem insignificant, it will create some problems if you are leasing the car, like me. I have 36K miles for the 3 year lease. If my odometer is fast, at the end of the lease I will have incurred 1,800 extra miles (5%). At $0.25 per each additional mile (over 36K), that's a penalty of $450.00!!!

    2. Member
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      10-04-2010 10:19 PM #2
      The CC speedo MPH reading is off by about 3-4mph, that is a known fact you check this forum.

      The actual miles traveled is correct, you may want to ask your dealer about the mileage traveled.
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    3. Member
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      10-04-2010 11:05 PM #3
      Quote Originally Posted by bigmikeo View Post
      The CC speedo MPH reading is off by about 3-4mph, that is a known fact you check this forum.

      The actual miles traveled is correct, you may want to ask your dealer about the mileage traveled.
      My CC speedometer reads 3 mph slower than actual speed. I only use my GPS as a speedometer.

      My Eos speedometer is almost dead on.
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    4. Member f.rizzo's Avatar
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      10-05-2010 12:49 AM #4
      My R32 speedo is 4mph fast.

      My aftermarket in dash Eclipse Nav/headunit matches the speedo because it gets the pulses from the com bus, but when I check it against radar gun at the track or even a Garmin, its over by 4mph.

      .
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    5. Member
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      10-05-2010 10:13 AM #5
      Quote Originally Posted by bigmikeo View Post
      The CC speedo MPH reading is off by about 3-4mph, that is a known fact you check this forum.

      That's been a fact with almost every car sold in America in the last 50 or 60 years.

    6. Member Bullitt_TDI's Avatar
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      10-05-2010 10:20 AM #6
      Quote Originally Posted by torpeau View Post
      That's been a fact with almost every car sold in America in the last 50 or 60 years.

      It's more evident in European Cars because of EU mandates

    7. Junior Member Passizle's Avatar
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      10-05-2010 11:28 AM #7
      My speedo on my 09 CC VR6 is right on with my Magellan porta-nav. Guess I'm lucky?

    8. Member
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      10-05-2010 02:07 PM #8
      Quote Originally Posted by torpeau View Post
      That's been a fact with almost every car sold in America in the last 50 or 60 years.
      I travel a lot and every rental I've had doesn't show this difference in comparison with a Garmin GPS.
      Ford and GM cars have been DNO and my Nissan van is also.

      Maybe my magnetic personality is wearing off?
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      10-05-2010 03:31 PM #9
      Quote Originally Posted by Bullitt_TDI View Post
      It's more evident in European Cars because of EU mandates

      Yeah, cars like Fords and Chevrolets.

      Maybe even worse with motorcycles.

    10. Member
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      10-06-2010 10:16 AM #10
      Quote Originally Posted by torpeau View Post
      That's been a fact with almost every car sold in America in the last 50 or 60 years.
      It is not a fact, and this is the first car I've ever owned in which the speedometer is not accurate. My wife's Hyundai is dead-on, as was my previous Acura. The 'fact' is that this car, unlike many if not most others - does not have an accurate gauge, which makes you wonder why they bother putting one in at all. I mean, who needs to know how fast they're going?

    11. Member
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      10-06-2010 11:02 AM #11
      Quote Originally Posted by alexjs1 View Post
      It is not a fact, and this is the first car I've ever owned in which the speedometer is not accurate. My wife's Hyundai is dead-on, as was my previous Acura. The 'fact' is that this car, unlike many if not most others - does not have an accurate gauge, which makes you wonder why they bother putting one in at all. I mean, who needs to know how fast they're going?
      If most cars today have accurate speedometers, that is a fairly recent development. I've read road tests in car magazines for years and the norm was that the the speedo was reading 60 when the cars were going 56 to 58mph. For whatever reason, R&T, C&D, MT and Automobile don't seem include that information in their tests now. My guess is that nobody really cared if the speedo was slightly fast.

      Here's an article on the subject that explains things better and points out that tire sizes, tire pressure and tire wear all all factors.http://www.caranddriver.com/features...andal!-feature

    12. Member gospeed-racer's Avatar
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      10-06-2010 02:39 PM #12
      If you check the digital speed display in the MFD, it will be accurate. The analog display is the only one that shows off. You can even check the cruise control speed display, it will be 2 to 3mph lower than the analog, but the same as the digital...

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      10-10-2010 11:51 PM #13

    14. Member
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      10-11-2010 12:09 AM #14
      Quote Originally Posted by wogeboy View Post

      Scott Evil and myself tried this in my CC with no change noticed.
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      10-11-2010 01:21 AM #15
      Quote Originally Posted by gospeed-racer View Post
      If you check the digital speed display in the MFD, it will be accurate. The analog display is the only one that shows off. You can even check the cruise control speed display, it will be 2 to 3mph lower than the analog, but the same as the digital...
      We do not have a true analog speedometer. The needle is reading digital.

      My digital needle and my MFD read exactly the same, which is actually 3 mph too fast, when compared to the real world.
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    16. Junior Member evan2010cc's Avatar
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      10-11-2010 02:00 AM #16
      Not that I want to confuse things any but I observed something fun today in my car while driving with the cruise control activated. The cruise was set to 80, the speedometer needle said 83 and the digital read out said 82. I was on a flat road so nope there was no external forces involved.

    17. Banner Advertiser VMRWheels's Avatar
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      10-11-2010 02:09 AM #17
      Quote Originally Posted by alexjs1 View Post
      It is not a fact, and this is the first car I've ever owned in which the speedometer is not accurate. My wife's Hyundai is dead-on, as was my previous Acura. The 'fact' is that this car, unlike many if not most others - does not have an accurate gauge, which makes you wonder why they bother putting one in at all. I mean, who needs to know how fast they're going?
      As someone else mentioned, the rolling diameter of the tires will have an affect on overall speed.

      I do recall reading, however, that by law, the speedometer must be within 3mph +/- actual speed when a car is in OEM form. From various cars I've tested, this seems to be accurate but some are closer than others, for various reasons.

    18. Junior Member
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      10-11-2010 07:28 PM #18
      When I started this tread, I was more concerned with the additional miles registering on the odometer. I couldn't care less about the accuracy of the speedometer - I am well aware that they are always "optimistic", and reading a few miles more than actual speed. Since my car is leased, and since they are charging $0.25 per extra mile (over the 12K/year allocated), I feel that I am being ripped off by VW...

    19. Member sfccryder's Avatar
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      10-11-2010 09:51 PM #19
      Quote Originally Posted by CC Fan View Post
      When I started this tread, I was more concerned with the additional miles registering on the odometer. I couldn't care less about the accuracy of the speedometer - I am well aware that they are always "optimistic", and reading a few miles more than actual speed. Since my car is leased, and since they are charging $0.25 per extra mile (over the 12K/year allocated), I feel that I am being ripped off by VW...
      if vw won't fix the problem, you can try getting tires slightly larger
      than stock diameter. this may bring you closer to actual miles travelled.
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    20. Member Veedubin02's Avatar
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      10-12-2010 08:42 AM #20
      Quote Originally Posted by CC Fan View Post
      When I started this tread, I was more concerned with the additional miles registering on the odometer. I couldn't care less about the accuracy of the speedometer - I am well aware that they are always "optimistic", and reading a few miles more than actual speed. Since my car is leased, and since they are charging $0.25 per extra mile (over the 12K/year allocated), I feel that I am being ripped off by VW...
      You're odometer is fine. If that was off in an OEM car VW could be sued and be put under federal investigation. Try this, find a straight road with little traffic, set the cruise control, then do in an reset one of the average mile settings in the MFD and see what it comes up as. In the CC I had this was always 2-4mph slower than what my Digital and "Analog" speedometers read. This adjustment is there so that if you get a ticket it greatly reduces the chance of you being able to sue VW because your speedo read slow. Its better for it to be reading a little fast. Its been like this in every VW/Audi I have owned. Once again your Odometer is fine.

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      10-12-2010 11:04 AM #21
      Driving with the GPS on, When the car says I am doing 83-84, the GPS says 79mph.
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    22. Member
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      10-12-2010 12:20 PM #22
      Quote Originally Posted by Ribz80 View Post
      Driving with the GPS on, When the car says I am doing 83-84, the GPS says 79mph.

      Maybe your tires are worn or their pressure is low or this is completely normal for your car -- not unusual.

    23. Member
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      10-12-2010 01:34 PM #23
      Quote Originally Posted by torpeau View Post
      Maybe your tires are worn or their pressure is low or this is completely normal for your car -- not unusual.
      Nope. Right out of a major service where pressures are adjusted and tires are pretty much new up front, still off by 3.5-4mph at 80.

      My wife's Sonata is just as bad. My BMW is the only one that is dead on with the GPS.
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    24. Member
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      10-12-2010 07:29 PM #24
      Quote Originally Posted by Ribz80 View Post
      Nope. Right out of a major service where pressures are adjusted and tires are pretty much new up front, still off by 3.5-4mph at 80.

      My wife's Sonata is just as bad. My BMW is the only one that is dead on with the GPS.
      Speedos reading faster than actuals has been common for decades. Your BMW was unusual.

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      10-13-2010 10:20 PM #25
      Tested mine today with gps and speedo showed 2 mph fast.

    26. Member CCRlineBlack's Avatar
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      10-14-2010 03:01 AM #26
      mine is 4mph faster

    27. Member
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      10-18-2010 07:18 PM #27
      My CC was 3-4mph off. Had a friend with a VagCom and changed the Distance Impulse Distance to 7.
      Now it is only about 2mph off. I can live with that.

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