Bigger tires
Senior Member
Joined: Oct 2018
Posts: 10,593
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From: Northern California
How much of a change are you going. Generally it is only about 1 mpg @ 60mph difference and not more the 2 mph max. However as far as I am aware tonight for the 2024 not sure anyone has the ECU program access for independents to change the speedo calibration and a dealer legally can only do it if the wheels and tire sizes are offered factory.
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Junior Member
Joined: Sep 2024
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From: Missouri
How much of a change are you going. Generally it is only about 1 mpg @ 60mph difference and not more the 2 mph max. However as far as I am aware tonight for the 2024 not sure anyone has the ECU program access for independents to change the speedo calibration and a dealer legally can only do it if the wheels and tire sizes are offered factory.
Senior Member
Joined: Oct 2018
Posts: 10,593
Likes: 229
From: Northern California
There are speed calculators on the internet you should go use them and see the difference. If it is within a mile or two mpg off its easy to remember and adjust your speed. Otherwise, you are going to be charged 1 hour min labor to correct (if possible). Now if it starts getting close to 5 mph difference which I know it won't then that is altogether different and can affect more than just the speedo reading.
Keep in mind that you also change your braking distance specification, and it may not be for the positive. There is no way to calculate that only to physically test it both on dry and wet pavement level ground using an accelerometer.
Keep in mind that you also change your braking distance specification, and it may not be for the positive. There is no way to calculate that only to physically test it both on dry and wet pavement level ground using an accelerometer.
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