speedo off

My 2010 totally base 2.7 manual reg cab tacoma was passed on the interstate yesterday by my wife,,Mrs. "I always drive the speed limit." I had my cruise set on 70mph and the wife went around me and off she went. We got home and she stated that in following me on the road her lumina speedo was showing me only doing 66mph,,she said when she passed me that her cruise was on 70. I can believe it as I get passed all the time when I am supposedly doing the speed limit.

Is this a common thing on our speedo's reading faster than what is the actual speed.

mark

 

According to my TomTom, my speedo was 3 mph fast at 70 with my factory size tires. There is a lot of talk about this on here.

 

yup, pretty common.

 

According to my GPS/ friends, my speedo is off by 12mph at 70

 

Yes. It's quite common for all makes, with Stock wheels/tires, for speedos to read are up to 10% faster than actual speed. I'm not sure if it's the 'nanny' factor or just anticipating that people go oversize tires.

 

That's funny. That's kind of how I discovered it years ago before I was even on any of the forums. My wife was following me home after getting new tires and called me on my cell. She wanted to know why I was only doing 61 in a 65 zone. Then we started checking it against radar. The '05 Highlander we had at the time was 100 percent accurate. The Tacoma speedo reads 4 mph fast at 65, 3 mph fast at 40, etc. Interestingly enough, while our old '05 Highlander was spot on, our '10 Highlander reads fast just like the Tacoma (by the same amount). Oh, and don't confuse the speedo reading fast with the odometer. Two separate processes. The odo will be accurate.

Here's a link to the acceptable error Toyota allows at each speed if you're interested:
http://i292.photobucket.com/albums/mm7/05Moose/Technical/Acceptible_Speedo_Error.jpg

 

My 70 is close to 65/66 mph. Checked it to a GPS , had to recalculate my mpg even. My KLR 650 did the same thing. I dont recall the precise wording , but feds allow a speedo to read slightly high but never low, so , that with liability , you end up with a sort of safety error.