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| This is a discussion on Speedometer shows 2 MPH faster than actual speed within the Gen III 2010 Prius Technical Discussion forums, part of the Gen III (2010+) Toyota Prius Forums category; 15 inch rims. My speedo is 2mph under what police radar setups show.... |
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Speedometer shows 2 MPH faster than actual speed
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10-01-2009, 05:04 PM
| #21 |
| Dr Curious Join Date: Aug 2009 Location: Louisiana
Posts: 505
My Car: 2010 Prius Model: II Package: No Package Thanks: 144
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Friends: 0 |  Re: Speedometer shows 2 MPH faster than actual speed 15 inch rims. My speedo is 2mph under what police radar setups show. |
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10-01-2009, 10:52 PM
| #22 |
| Member Join Date: Aug 2009 Location: Sour Lake, Texas
Posts: 78
My Car: 2010 Prius Model: IV Package: Solar Roof Thanks: 1
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Friends: 0 | Re: Speedometer shows 2 MPH faster than actual speed I wonder if this is also the reason why the puter MPG is higher than actual calculated. I suspect so. I haven't checked via a GPS yet. --Mickey |
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10-02-2009, 12:36 AM
| #23 | |
| SuperMID designer  Join Date: Dec 2003 Location: Yokohama, JAPAN
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Friends: 8 | Re: Speedometer shows 2 MPH faster than actual speed Quote:
The "trip distance" is fairly accurate. It looks the "fuel usage" is intentionally biased 5%. The speedometer display is also intentionally biased to meet the regulation. Ken@Japan | |
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10-02-2009, 01:32 PM
| #24 | |
| Junior Member Join Date: Sep 2009 Location: Florida
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My Car: 2010 Prius Model: V Package: #8 Thanks: 0
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Friends: 0 | Re: Speedometer shows 2 MPH faster than actual speed Quote:
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10-07-2009, 12:51 PM
| #25 |
| Senior Member  Join Date: Jun 2009 Location: The Aloha State
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My Car: 2010 Prius Model: IV Package: Navigation Thanks: 0
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Friends: 0 | Re: Speedometer shows 2 MPH faster than actual speed you guys know when the tire tread wears down, the speedometer reading is more accurate, right? When the tread is almost gone, the speedometer will be about spot on.... as the circumference changes, the distance traveled is reduced by 4% (or roughly 2 MPH at 50MPH) as it wears out. Last edited by Jon S; 10-07-2009 at 12:54 PM. |
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10-07-2009, 02:07 PM
| #26 | ||
| SuperMID designer Join Date: Dec 2003 Location: Yokohama, JAPAN
Posts: 1,999
My Car: 2010 Prius Model: N/A Package: G Thanks: 11
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Friends: 8 | Re: Speedometer shows 2 MPH faster than actual speed Quote:
Quote:
Ken@Japan | ||
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10-07-2009, 06:55 PM
| #27 |
| Senior Member Join Date: Jun 2009 Location: The Aloha State
Posts: 150
My Car: 2010 Prius Model: IV Package: Navigation Thanks: 0
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Friends: 0 | Re: Speedometer shows 2 MPH faster than actual speed Oops... I stand corrected... I got it backwards.... stupid math.... |
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11-11-2009, 11:42 AM
| #28 |
| Senior Member  Join Date: Aug 2009 Location: Wilmington, NC
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My Car: 2010 Prius Model: III Package: Navigation Thanks: 11
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Friends: 0 | Re: Speedometer shows 2 MPH faster than actual speed This thread has been around for some time but I just learned how to get in to the Service Menu on my Gen III. One of the items on this service menu is GPS and Sensors page. One of these sensors is the speed sensor. While driving to work this morning with the CC set at 60 mph, the Service Menu page displayed the reading of the speed sensor to be 57 mph. So my car is actually biased by 3 mph. |
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11-11-2009, 12:52 PM
| #29 |
| awaaay  Join Date: Mar 2005 Location: Vancouver, BC
Posts: 10,733
My Car: 2004 Prius Model: Package: Base Thanks: 47
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Friends: 63 | After installing new tires with a slightly higher rpm than stock (863 vs 855), my wife can assure you the speedometer is calibrated perfectly, right up to 136 kmh.  |
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11-11-2009, 01:18 PM
| #30 | |
| Senior Member  Join Date: Dec 2004
Posts: 183
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Friends: 0 | Re: Speedometer shows 2 MPH faster than actual speed Quote:
Can you state what tires and size you are using? This 2mph off reading has always bothered me. I've tracked the actual distance traveled and that was off too. Came out to be about 1 mile off for every 50 miles. Which means the mpg reading would be off too for many people. Thanks Last edited by saechaka; 11-11-2009 at 01:20 PM. | |
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| actual, faster, mph, shows, speed, speedometer |
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