Mine does this too!!! It doesn’t happen all the time though which is strange but it happens more often then not.


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I wonder if there's some sort of software update or ECU fix that they have ?

It may or may not be worth a trip to the dealer... I don't wanna get a "it's 1mph - deal with it"

 

My 2015 XSE does the same thing under cruise control. I feel like it's the system rounding up the speed to the nearest whole number. Pure speculation on my part.

 

I get it but no big deal. I just push up the button to increase mph by 1. Done.

Ian B

 

What is disturbing is you are in the left-hand lane with people passing you on the right, and your Lane keep assist alerted to remind you that you aren't paying sufficient attention to your driving. You should not be doing something so distracting while driving. Quit making videos while going slow in the passing lane. Set your cruise 1 mph faster if it bothers you.

 

Thanks for your input! That's actually a friend.It was an opportune time to make this video as the roads were relatively empty. I willingly let LKA kick in, to see if that would reset it.

 

I don't think it's setting it 1mph at all. I think what's actually happening is that you get to speed and then you let your foot off the pedal and press the button. By the time it kicks in you've slowed down. Try keeping your foot on the pedal and then press the button and wait for it to kick in firet before taking your foot off accelerator and it should hold where you're at. I never had this issue but even if it was, 1 mph is nothing.

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Tried it both ways - still get the same result. I know 1mph is nothing - but it's a little annoying to look at, especially on longer trips.

Also I feel like I shouldn't be compromising on a brand new vehicle that has an over 30k sticker. It's the little tings that make / break user experience. Isn't it?

 

I haven't noticed it in my 2018 Camry (SE Hybrid), but a family member's 2013 Avalon Hybrid frequently shows the set speed as being 1 MPH higher than what the digital speedometer reports.

 

It's the car's way of encouraging you to get out of the passing lane when not passing other vehicles.

 

Yeah...you guys worried about the clock gaining a minute, and the cruise running 1 MPH slow, should just move over to the left, and ponder your problems, so I can pass you. Thanks!!!!

 

Sorry for actually bothering with User Experience!

 

I can't find anything on the manual about it. My car does the same thing but if there is a vehicle in front of me it does match the speed exactly. I'll try it again when I drive home from work but I saw it hit the target when the radar picked up a car in front of me. I have the DRCC with Full Speed.

 

Mine does, sometimes. It depends what mood it is in. BTW, turn off your LDA :wink:

 

It is rounding. I have played with this many times. If you go to the "high end" of 70, right before 71 and set it it'll say 70. It's just the slight fractional changes that the system is rounding oddly. The cruise must think 69.1-70 is 70 but the speedometer is 69.5-70 rounds to 70. (Guessing so you don't end up above the set speed?)

 

Ignoring that the speedometer is likely more than 1mph off anyways.


Ever compare it to a GPS on a flat road at constant speed?

 

1mph? Seriously?
This is the definition of "first world problems"
1mph is going to make a difference of a whopping 10 seconds on your commute to work.

 

One other thing to consider; Toyota might have intentionally programmed it that way so it's not changing the load & speed as often, if it's within 1 it probably just idles along and does its thing vs having to apply throttle just to gain 1 unit of speed. Gotta keep those EPA numbers!

 

Nothing to do with EPA... it's just standard programming.
There is always some level of hysteresis in the programming, since it is physically impossible to constantly maintain a specific set number, whether it is speed on a cruise control, or the temperature of a thermostat. The hysteresis level is generally appropriate for the device... higher precision medical and industrial/aerospace devices may be measuring in the .001 level, but for consumer products it can be a couple of degrees or MPH. These devices maintain their setting based on some feedback mechanism, and there is a delay in the sensor getting the reading back to the circuit, and there's a delay in the physical response to the correction.

Thank God nobody is measuring their cabin temperature and comparing it to their set temperature >

 

https://www.thrillist.com/cars/your...eter-is-wrong-speed-calibration-inaccuracy-in-german-american-and-japanese-cars

 

https://www.thrillist.com/cars/your...eter-is-wrong-speed-calibration-inaccuracy-in-german-american-and-japanese-cars

This.

Just drive with the flow of traffic and you're safe from tickets.
When there's no traffic, pick a comfortable speed around the limit, and realize that in most areas, the "tolerance" for a ticket is 5-10mph at highway speeds.
Ya, 40 in a 35 might get you a ticket, but 75 in a 70 isn't going to get you a 2nd look unless you're making frequent lane changes to maintain speed.

Honestly, 30 in a 40 SHOULD get you a ticket

 

Ran mine with GPS for "fun". I set cruise when my digital readout said 50, the cruise set was 50, and the GPS reading was 49.2-49.6. But there are times when setting it at 50 it will only show 49 on the digital readout and that showed more of a 48.5-49.1 reading on the GPS.

 

Hi Folks,

I was wondering if anyone else had noticed that the cruise control holds the speed at 1mph below the set speed when using the DRCC (whether or not there is a car in front.) Or if I am the only one having this issue...

I've attached a video demonstrating the issue.

https://youtu.be/_aEtYJPep3Y

Thanks!

I also have this issue, and I agree that it's an issue when the car can't match what is set for the speed (first world problem, or whatever folks may call it, okay okay). It's annoying, but not a deal breaker if everything else works. My car also has weird noise when full speed DRCC engages, some wheezing high-pitch sound when climate control works at high fan speed, among others and that's why I am not disturbed as much with this 1 mph discrepancy. It's has changed my expectations of Toyota in terms of user experience and attention to details, but time will tell how more important stuff like reliability is being affected.
But everyone has the right to be disappointed/frustrated if what they have purchased, doesn't meet the stated expectations.

 

But everyone has the right to be disappointed/frustrated if what they have purchased, doesn't meet the stated expectations.

Unless those expectations are unreasonable.

A child might think that if their parent goes to a hospital for an appendectomy, that, like an auto mechanic, the doctor should "fix" everything else such as the bad knees and heart condition.
We all know that is an unreasonable expectation.
It's the same when owners project their idea of how a vehicle feature *should* work against what it actually does, when there is no claim by the manufacturer that it does anything differently than it actually does, e.g. automatic climate control. The actual temperature of the cabin will rarely match the set temperature, and is influenced by ambient.

Expecting the cruise control to be EXACTLY the same speed as the set point is an unreasonable expectation from the technology built into a $30,000 vehicle.

 

Hold Toyota To A Higher Standard

I have also found this problem. This isn't about just a petty 1mph... Its about holding a car company and a brand to a higher standard! 1mph means inaccuracy... it means someone screwed up. Why do so many people in this forum just think adding 1mph and stop talking about it is the solution? If you car was getting 1hp less or ran 1 second less in a quarter mile would you be so unbothered? I would expect to see "Toyota Nation" have higher expectations and more stringent standards... Not throw bandaids and excuses at people trying to find solutions!

 

Why do so many people in this forum just think adding 1mph and stop talking about it is the solution? If you car was getting 1hp less or ran 1 second less in a quarter mile would you be so unbothered?

To those of us that deal with life-and-death decisions as part of our everyday work, none of this is even worth mentioning. Nor would 1 second less in a quarter mile in a passenger car, nor would 1 less HP in a passenger car. It's not worth the self-incurred angst.

Anyone that posts such laments on a public forum has willingly, if unwittingly, opened up chances for comments that can belittle or be dismissive. Such is the implied risk in an public forum.

The original disappointment is not interesting to me. That there are apparently others that feel just as jaded is what piques my interest enough to return and comment.

I find the offered solutions to be appropriate for the level of importance of the complaint of inaccuracy. Perhaps you don't. I remain unbothered, and opine that my approach and attitude is because I am apparently more easily satisfied than those that are bothered. To those so bothered, I say: Toyota is building cars for the masses. If you want something with fewer compromises, you'll have to go elsewhere and spend proportionately more...and you may find yourself still bothered..especially for the price you will pay. The more you pay, the more you will experience diminishing returns per dollar spent.

 

Wow, 3 pages over 1mph different in cruise control. Smh. lol

Ian B

 

Actual fact...The cruise control will show the vehicles actual speed according to the vehicle speed sensor, and is the same speed that runs the odometer. Assuming the tires are the manufacturer recommended size.

The analog speedometer is fed through a digital signal, it always set to show slightly faster than the actual speed in every Toyota. I've always thought it as a liability thing.

 

My 2019 Avalon does the same thing, so did my 2015 Avalon, and so does my 2008 Corvette - I'm calling it: "That's how they work" and moving on .....

 

I have OCD and this doesn't bother me that much, I just take it as it is. If it were off more then 1 then I might be bothered.

 

We took a 3000 mile road trip over the holiday. It bothered me because sometimes it was 1 mph slow, other times dead on. I run waze on my iphone xs and would compare my speed to gps. It seemed to behave if i set the cruise to a speed higher than the car in front of me. Increasing tire pressure seemed to help, but not eliminate the issue. I bet a simple flash of one of the modules would fix the issue. Anyone have a TIS to read into the modules?

Nothing wrong with wanting perfection; also nothing wrong with not sweating the little things. All be nice and go on your ways.