My trip meter is showing more miles than my odometer

[jeffaa]

Not sure how or when this started happening, but I just noticed it today. The odometer catches up after about 1/4 mile.

(Trip B is reset for winter weather to see how much more energy I use.)

 

[pilotSteve]

Uhhhhh rounding error! Come on :wink:

 

[brianman]

Here's another one to ponder:

"But but... maybe your car started with some weirdness with Trip B starting after some climate control or something"

Ok, but that doesn't explain how the gap rose from 0, to 0.3, to 0.6, to 0.7, and now 0.8 over the last year+.

 

[jerry33]

View attachment 43320

8900.6/8899.8 = 1.00008988966044180768
8899.8/8900.6 = 0.99991011841898298991

Four zeros after the decimal point is somewhat smaller than I can see. Precision != accuracy. I'd put it down binary math rounding errors. In automotive measurements, outside of a testing facility, there are so many variables that I use +-5% as whether things are significant or not.

 

[brianman]

You're assuming it's stored as a float (especially a < 32 bit float) which would have been a horrible choice on Tesla's part, IMO.

Here's some of what I see in my pictures...

0

11096.8	4332.5	390
11096.8	4332.5	390

0.1

11324	4414.1	390
11324	4414.2	390

0.2

12233	4729.5	387
12233	4729.7	387

0.3

13482	5180.1	384
13482	5180.4	384

15061	5808.7	386
15061	5809.0	386

0.4

15162	5841.7	385
15162	5842.1	385

17029	6522.5	383
17029	6522.9	385

0.5

18508	7071.5	382
18508	7072.0	382

0.6

19376	7512.2	388
19376	7512.8	388

0.7

20731	8057.5	389
20731	8058.2	389

21776	8454.4	388
21776	8455.1	388

0.8

21884	8504.2	389
21884	8505	389

22892	8899.8	389
22892	8900.6	389

0.9

23357	9115.6	390
23357	9116.5	390

Just looking at these numbers, it appears the separation is growing more quickly with mileage. This is the opposite of how I would expect float rounding issues to surface.

 

[jcaspar]

I would just reset Trip A. Problem solved!!:wink:

 

[davewill]

A man with two clocks never knows what time it really is.

 

[aviators99]

Maybe Ferris Bueller was right?

 

[neroden]

See what it looks like in kilometers? This has all the hallmarks of two different rounding algorithms being used during unit conversion.

 

[medved]

Can someone tell me please how to put the trip meter where the OP has it; but i would prefer it on the right side. Thanks

 

[Chipper]

Just hold down the scroll wheel and select what you want and where you want it. Works for both sides.

 

[moviemaker2000]

Not sure how or when this started happening, but I just noticed it today. The odometer catches up after about 1/4 mile.

View attachment 43224

(Trip B is reset for winter weather to see how much more energy I use.)

I have noticed that if you try rebooting the dash while the car is in motion the odometer will read 0 miles for a few seconds while it cycles through the initialization process. I haven't noticed the same behavior on the center screen (trip A/B). So, if you have ever rebooted while moving it probably isn't recording the fractional miles you travel during those few seconds it is reading 0.

 

[medved]

Just hold down the scroll wheel and select what you want and where you want it. Works for both sides.

when i do that on the right side there are options to choose from but not the trip meter. And when i do that on the left side it just pauses the music.

 

[tslas]

You need to keep it pressed down approx 3 seconds