Speed off by 1mph
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Cross-Country
Joined: Feb 2024
Posts: 52
Likes: 20
Speed off by 1mph
Ok, here it is and it drives me nuts. My 2024 speedo is off by 1 mph as compared to gps speed from Waze, Google maps, Apple maps, or speedometer apps. This truck has just over 5000 miles on it.
The odd thing is that my 2020 was the same way, I though it was tires and when I replaced tires it was the same result.
Interesting but what is the cure to make them match?
The odd thing is that my 2020 was the same way, I though it was tires and when I replaced tires it was the same result.
Interesting but what is the cure to make them match?
More Turbo
Joined: Sep 2009
Posts: 537
Likes: 198
Fairly common for the past 20 years, since stand alone gps units first started to be a thing. I’ve always kinda thought it was intentional.
On a 2006 Chevy 2500HD I had, when I went from the stock 245/75R16 tires to 265/75R16, the speedo and gps were a match.
On a 2006 Chevy 2500HD I had, when I went from the stock 245/75R16 tires to 265/75R16, the speedo and gps were a match.
Mountain Pass
Joined: Aug 2020
Posts: 200
Likes: 30
From: Spokane, WA
Speedometers are inherently fast on most cars. Serves a couple purposes and Honda even got in trouble for it at one point. It will give you a little buffer as you won't be going as fast as you think you are, but then you'll also rack up miles quicker which means sooner service intervals and warranty expiration.
When I put on the new MT Baja Boss tires and went to 305s, the little increase in overall diameter has put mine almost spot on with the speed signs and Google maps.
When I put on the new MT Baja Boss tires and went to 305s, the little increase in overall diameter has put mine almost spot on with the speed signs and Google maps.
Logistics Pro
Joined: Sep 2002
Posts: 4,410
Likes: 1,016
From: Central KY
Yeah, I have some OCD too.....but c'mon man. 1 MPH? That's EASILY within the range of expected error.
Is it 1 MPH too slow? If so, it'll become spot-on the money as your tire tread wears down. Leave it alone.
Is it 1 MPH too slow? If so, it'll become spot-on the money as your tire tread wears down. Leave it alone.
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Lead Driver
Joined: Jan 2002
Posts: 8,644
Likes: 4,733
From: Itinerant
Not taking OP seriously as driving him nuts because the post wasn't started with a dollar amount paid for truck. Only guys paying near and making us know they paid a $100k complain about trivial items. 
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Fleet Mechanic
Joined: Jul 2013
Posts: 1,997
Likes: 237
From: NE Ohio
speedometers are never that accurate unless you want to pay someone to certify it like the police units are.
there is always a 1-5 mph variance +/- which is why you don't normally get pulled over for doing 5 over the posted limit..
there is always a 1-5 mph variance +/- which is why you don't normally get pulled over for doing 5 over the posted limit..
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
Only 1 mph is extremely close to accurate. But then, you didn't say at what speed it is off by 1. If it is off by 1 at 10 mph, that's 10% error. If it is off 1 at 100 mph, that's 1% error. The error should always be noted as a ratio.
An error of 5% has always been very common across all brands, and always on the slower side. Reasons already noted above.
An error of 5% has always been very common across all brands, and always on the slower side. Reasons already noted above.
