How accurate is your speedometer?

[Huskymaniac]

I checked mine for the first time today with a GPS and was surprised to see it reading about 5% too low. I need to have the speedo read about 73-74 to be going around 70.

So what have other people experienced? And does this inaccuracy exist in the odometer too or is that more accurate?

[Hocrest]

Mine varies with tires. With some "snow's I've been about 5% off. With the current tires I'm right on.

[LetItSnow]

My Pearly read very close to the GPS. I haven't checked the Silver yet.

[Manarius]

I'd say that as I go faster, the speedo becomes more and more inaccurate. At 77 on the speedo, I read about 73-74mph on the gps. That's running on 45/R17's. Same as my mom's 2008 Impala; stock tires/rims and as you go faster, it starts to get more and more inaccurate.

[Huskymaniac]

Originally Posted by Manarius

I'd say that as I go faster, the speedo becomes more and more inaccurate. At 77 on the speedo, I read about 73-74mph on the gps. That's running on 45/R17's. Same as my mom's 2008 Impala; stock tires/rims and as you go faster, it starts to get more and more inaccurate.

If the speedo is off, will the odometer be off too?

[ZMan]

Originally Posted by Huskymaniac

If the speedo is off, will the odometer be off too?

Of course.

[NikFu S.]

My speedometer seems to be extremely accurate. It reads the same as the GPS up until 70, at least. Beyond that I won't say.

[Mr. Claret]

My first two claret were each 4mph under. The teal is about 2mph under. I read on here at one time that most all are around 4 mph under so 10% off the odometer and would be real close. As i said read it somewhere on here, not quoting.

[kwren]

.................................