Cruise control wont go 73mph??

[SC4R3C120W]

I noticed something today that i never picked up on before. I typically set my cruise control going to work every day, usually at 70 or 75mph depending on traffic. Today i noticed that when trying to go up from 70 to 75, it skipped 73.  it went 71, 72, 74, 75. I thought that was weird, so i tried to go down from 75, and sure enough, no 73.

 

Then i changed my display from fuel economy to speed, took off cruise control, went 73, then tried to set cruise. It set cruise at 72, but mainly stayed at 73 on the speedometer display. And again, from there, going up or down it skipped 73.

 

Although it's not a huge issue, i thought it was weird and wondering if everyone else has the same thing.

 

As for my setup, I do have larger tires (275/70/18) and a speedometer calibrator (rough country), but can't imagine either would change the cruise control to not pick up that number. I think my car is updated on all firmware / tech as it had issues with codes before.

[Denali_1500]

not uncommon at all. there is a algorithm that works out the speed and some MPH numbers are skipped because they could not be resolved at the XX.0 or XX.1 level. If it was XX.5 and above that MPH was skipped. 

[eppieguy]

I can't set my cruise at 80, it's either 79 or 81, I have a post about it here someplace, thought it was odd as well.

[ESierra]

That's strange. I'll have to take a look at that today. I usually cruise control at 75 or 80mph anyway. 

[jlong1984]

On 8/4/2022 at 10:14 AM, eppieguy said:

I can't set my cruise at 80, it's either 79 or 81, I have a post about it here someplace, thought it was odd as well.

I can for sure set mine to 80. I'll have to try 73 and see if it works or not.