odometer / speedometer accuracy
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Senior User
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From: Spokane, WA
odometer / speedometer accuracy
My odometer is right on; only off by a tenth of a mile after nearly 200 mile post.
So how can it be that my speedometer reads about 6% higher than my actual speed?
So how can it be that my speedometer reads about 6% higher than my actual speed?
Lead Driver
Joined: Jan 2010
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If you have OEM tires the truck knows what speed it is going, it's just not showing that to you.
I can't say this with all trucks, but if I put my truck into engineer mode, the digital MPH is close to both GPS's I own within a few tenth's of a MPH because the display takes the speed 1 decimal place.
The speedometer on mine can be around 2-3 MPH fast with OEM ContiTrac tires.
I can't say this with all trucks, but if I put my truck into engineer mode, the digital MPH is close to both GPS's I own within a few tenth's of a MPH because the display takes the speed 1 decimal place.
The speedometer on mine can be around 2-3 MPH fast with OEM ContiTrac tires.
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Senior User
Joined: Feb 2011
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From: Spokane, WA
I don't have the fancy display screen, so the engineering screen is foreign to me.
In the good 'ole days we'd check our speedo accuracy using mile marker, but in these trucks there appears to be a disconnect.
P.S.
stock OEM BFG's
In the good 'ole days we'd check our speedo accuracy using mile marker, but in these trucks there appears to be a disconnect.
P.S.
stock OEM BFG's
Lead Driver
Joined: Jan 2010
Posts: 6,600
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Check out the discussion we had on this awhile back.
https://www.ford-trucks.com/forums/1...ml#post9776641
https://www.ford-trucks.com/forums/1...test-mode.html
For the gauge, I've heard this too so I think you're right.
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From: Spokane, WA
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In your case, it is exactly the opposite - but also 6% off. Interesting....
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Senior User
Joined: Feb 2011
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From: Spokane, WA
Your scenario is better. Accurate speedo, and the truck will show lower miles on it. My 6% is based on those "your speed is" signs all over town.
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