Speedometer vs GPS Speed
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2nd gear
Joined: Jun 2026
Posts: 2
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Speedometer vs GPS Speed
Speedometer reads significantly slower than GPS using Waze. The faster I go the bigger the difference. Looking online I see some folks having just the opposite problem but have seen nothing working this way. I checked the tire size on my 2024 RX 350 F Sport Handling, and they are what the network says it should be 235x50 R 21. Saw some test done using a police radar system and it showed the opposite of the problem I seem to have. All of those said the Waze GPS speed is the more accurate. anyone run into this issue?
Lexus Test Driver
Joined: Jul 2017
Posts: 9,626
Likes: 3,422
From: NJ
Speedometer reads significantly slower than GPS using Waze. The faster I go the bigger the difference. Looking online I see some folks having just the opposite problem but have seen nothing working this way. I checked the tire size on my 2024 RX 350 F Sport Handling, and they are what the network says it should be 235x50 R 21. Saw some test done using a police radar system and it showed the opposite of the problem I seem to have. All of those said the Waze GPS speed is the more accurate. anyone run into this issue?
Intermediate
Joined: Sep 2025
Posts: 285
Likes: 223
From: FL
Speedometer reads significantly slower than GPS using Waze. The faster I go the bigger the difference. Looking online I see some folks having just the opposite problem but have seen nothing working this way. I checked the tire size on my 2024 RX 350 F Sport Handling, and they are what the network says it should be 235x50 R 21. Saw some test done using a police radar system and it showed the opposite of the problem I seem to have. All of those said the Waze GPS speed is the more accurate. anyone run into this issue?
Intermediate
Joined: Sep 2025
Posts: 285
Likes: 223
From: FL
Intermediate
Joined: Jul 2013
Posts: 359
Likes: 149
From: Texas
A very senior Texas State Trooper acquaintance told me
“always trust your GPS.”
Two or three miles per hour might seem insignificant.
The car may be showing only eight mph over the limit and that might be within the trooper’s personal tolerance envelope. But if you’re REALLY doing 11mph over, you’re likely to get a ticket.
“always trust your GPS.”
Two or three miles per hour might seem insignificant.
The car may be showing only eight mph over the limit and that might be within the trooper’s personal tolerance envelope. But if you’re REALLY doing 11mph over, you’re likely to get a ticket.
Lexus Test Driver
Joined: Jul 2017
Posts: 9,626
Likes: 3,422
From: NJ
A very senior Texas State Trooper acquaintance told me
“always trust your GPS.”
Two or three miles per hour might seem insignificant.
The car may be showing only eight mph over the limit and that might be within the trooper’s personal tolerance envelope. But if you’re REALLY doing 11mph over, you’re likely to get a ticket.
“always trust your GPS.”
Two or three miles per hour might seem insignificant.
The car may be showing only eight mph over the limit and that might be within the trooper’s personal tolerance envelope. But if you’re REALLY doing 11mph over, you’re likely to get a ticket.
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