Speedometer not accurate

[Sagebrush]

A GPS app on your phone is only accurate for straight stretches. I've checked mine, and I'm within 1 MPH.

Close enough.

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[Daveintb]

After I swapped out my tires to 33”, I took it to the dealer to have the speedometer programmed as I wanted an accurate speedo. After checking with his techs the service manager told me that they have no way of doing that. . Guess I’m just stuck with a 3-4 off speedo.

 

[ambit]

My SR5 is low by 2-3 mph at "80" and the gas milage remaining lies too.

 

[tacorancher]

I put 275/70/18s which are almost an inch taller and my speed still shows I’m 1-2pm mph slower than GPS lol…. Guess I need to go even bigger.

I drove 150+ miles today at 65-75 mph and it was off 2mph most of the way (showing 2mph slower than actual)

 

[BLtheP]

I can see being conservative on the speedo but 2 mph is too much. Doing the math, at 30k indicated the true mileage is 31k. At 75k indicated it's 77.5k.

Typically the odometer is accurate while the speedo is fast.

And if it wasn’t correct on the odometer, then your math would be backwards. You’d show 31K on the dash when you actually had only gone 30K. But the odometer can’t be inaccurate like that because they can’t short people on warranties.

So just drive it and know that when you’re going highway speed, you’re actually traveling 3ish mph slower than the dash says.

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