10-22-2008, 09:01 AM
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#1 |
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Senior Member
  
Joined: Oct 2008, #9763
Location: Minnesota
Age: 32
Gender: Male
Posts: 1,735
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Possible conspiracy??
I got my ScanGuage II in a few days ago and installed it right away. I am VERY pleased with it and find it very interesting to see how accelerating affects MPG...
But one thing I've noticed as well is that the MPH I get on the ScanGuage is about 3-4 MPH slower than the speedometer. I have also read this a lot around the forum from people with GPS units. So, my question is this - is Toyota (and any other car manufacturer for that matter) giving the whole +/- 3 MPH (although all the claims I see has that on the plus (+) side) tolerance in the speedometer accuracy an attempt to get out of warranty claims early? Because, if I do the math correctly, a higher MPH will result in inaccurate odometer readings, reading higher than the "actual" mileage driven. Just something I've been thinking about...........
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I'm just a Texan that got lost on the way to the grocery store and ended up in Minnesota...  |
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10-22-2008, 09:03 AM
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#2 |
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TW Mid-Shift: The Architect
Joined: Mar 2008, #5340
Location: Chihuahua, Mexico
Age: 27
Gender: Dude
Posts: 5,517
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Yep well my odometer is about 2 miles off slower i checked that on the gps of my cell phone....
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10-22-2008, 09:05 AM
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#3 |
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Southern Louisiana
Joined: Feb 2008, #4929
Location: Kaplan, Louisiana
Age: 26
Gender: Guy
Posts: 1,939
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Yep its true they are yet again cheating us. Thats why I installed my lift and tires so early on, less than 10,000 miles. Now all is good, well I am 2.7 mph faster now.
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10-22-2008, 09:06 AM
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#4 |
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San Diego Chapter
Joined: Mar 2007, #1146
Location: So.Cali
Posts: 3,858
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im about 3mph off oh well i cant even spell Conspear -acy lol
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10-22-2008, 09:07 AM
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#5 | |
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Senior Member
Joined: Oct 2008, #9763
Location: Minnesota
Age: 32
Gender: Male
Posts: 1,735
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Quote:
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I'm just a Texan that got lost on the way to the grocery store and ended up in Minnesota... |
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10-22-2008, 09:11 AM
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#6 |
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Why am I always the little spoon?
Joined: Feb 2007, #872
Location: Metairie, LA
Gender: Dude
Posts: 6,680
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and it is also affecting perceived gas mileage.
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Tacoma World: One big happily dysfunctional family. |
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10-22-2008, 09:12 AM
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#7 |
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Senior Member
 Joined: Oct 2007, #3036
Gender: Male
Posts: 1,152
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speedo errors have been around since the 50's that i know of !
wonder what would happen if exact or error the other way? maybe class action suits for "gee i got a ticket for speeding" |
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10-22-2008, 09:17 AM
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#8 | |
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Senior Member
Joined: Oct 2008, #9763
Location: Minnesota
Age: 32
Gender: Male
Posts: 1,735
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Quote:
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I'm just a Texan that got lost on the way to the grocery store and ended up in Minnesota... |
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10-22-2008, 09:40 AM
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#9 |
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My other ride has sails
 Joined: Jan 2008, #4149
Location: Rhode Island
Age: 45
Gender: Male
Posts: 2,201
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My scanguage speed is off from my speedometer BUT... If I look at the mileage it ends up matching the odometer exactly. I havn't compared it to a GPS's distance estimate but I'm sure it's darned close. (At least on my truck)
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"Life's journeys End is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways, totally worn out, shouting "...holy shit what a ride!" |
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10-22-2008, 09:48 AM
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#10 | |
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Senior Member
Joined: Oct 2008, #9763
Location: Minnesota
Age: 32
Gender: Male
Posts: 1,735
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Quote:
Kinda like taking $.0001 from every bank account in a bank. No single person notices. But multiply that out to all the accounts in the bank and you have millions of dollars...
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I'm just a Texan that got lost on the way to the grocery store and ended up in Minnesota... |
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10-22-2008, 10:15 AM
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#11 |
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Just Hanging Out.
 Joined: May 2008, #7011
Location: Panhandle Florida
Age: 24
Posts: 934
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OR spring for the $250 speedo calibrator. (Which you should probably still do after the tires-cause your speed may be wrong the other way...)
Good luck finding a vechicle out there that doesn't have a bit or error built in.
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Namaste Brunes 
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10-22-2008, 12:10 PM
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#12 |
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Pre Senior Citizen
Joined: Mar 2007, #1138
Location: Lancaster, PA
Age: 41
Gender: Female
Posts: 2,920
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My Speedometer is 2mph faster than the scangauge II. But when you compare the scangauge with the GPS - it's accurate. So - the speedometer needle isn't calibrated properly.
I also did a slow driving mile to compare with the GPS. Only did it once, but the Scangauge was only off by .02 of a mile.
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10-22-2008, 12:33 PM
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Southern by the Grace of God
Joined: May 2008, #6624
Location: Birmingham, AL
Age: 26
Gender: Male
Posts: 575
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It seems to me that the MPH and the distance traveled aren't really related. Even if the spedometer is off by +/- 3mph, that doesn't mean the odometer is off by that much. The real test would be to start your trip odometer when you pass an interstate mile-marker, and check to see that it rolls over every time you pass another one. After 20 or 50 miles, see how far off (if at all) you are.
If your tires are bigger than stock, then you'll actually be traveling further than your odometer records. Good for you... not so good for the Toyo warranty department. I did the math... if you were to change your stock (16") tires for 17" tires when your odometer read zero miles, you could actually drive 38,250 miles before your odometer would read 36k miles. If you changed to 18" tires, you could drive 40.5k miles before your odometer read 36k.
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There are no stupid questions... only inquisitive idiots! |
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10-22-2008, 12:53 PM
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#14 |
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Impulse Red Alliance: West, B.F.E.
Joined: Aug 2008, #8749
Location: CEN CAL
Age: 24
Gender: Male
Posts: 497
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aww hell My head hurts now.
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10-22-2008, 12:57 PM
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#15 | |
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Senior Member
Joined: Oct 2008, #9763
Location: Minnesota
Age: 32
Gender: Male
Posts: 1,735
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Quote:
However, I know what you mean and get your point! 
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I'm just a Texan that got lost on the way to the grocery store and ended up in Minnesota... |
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10-22-2008, 01:11 PM
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#16 |
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Junior Member
Joined: Sep 2008, #9115
Location: Ontario
Posts: 10
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Auto manufacters are allowed 4% error in speedo/odo readings by law, anymore/less should not have made it through quality control, plus most manufacturers give a 1000 mile warranty grace period, so IMO it works out in the wash, in production extra accuracy equals extra time and money, personally I'm hoping tacomas dont go up anymore in price so I'll live with it
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10-22-2008, 01:14 PM
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Southern by the Grace of God
Joined: May 2008, #6624
Location: Birmingham, AL
Age: 26
Gender: Male
Posts: 575
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Quote:
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There are no stupid questions... only inquisitive idiots! |
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10-22-2008, 01:57 PM
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#18 | |
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Pre Senior Citizen
Joined: Mar 2007, #1138
Location: Lancaster, PA
Age: 41
Gender: Female
Posts: 2,920
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Quote:
However - the speedo on your dash may or may not be calibrated to the actual readings from the computer. That's where the Scangauge II comes in. The Scangauge takes the MPH and distance directly off the ECU (computer). I actually look more at my scangauge for MPH than I do my dash.
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