I guess I need to be a garlic farmer

[Zprime29]

I've been hesitant to complain about this, but it's getting too irritating. I think I've got a vampire hiding somewhere in my lightning. I had new A/T tires put on back in Nov '24. Overall, seems like less than 5% (if any at all) hit to range. Win. HOWEVER...I have a new, um, glitch I've been dealing with. My morning commute still takes me the normal 6-7% SOC, I usually park with about 64% SOC showing. The past couple months, after work (so it's warmer than when I parked) I'll lose 3% SOC in the first 0.1 mile, then it acts like normal.

I've been meaning to try and record this with my OBD adapter but keep forgetting. Will try to get some data to post this week. In the mean time, has anyone else encountered anything like this?

I tried charging to 100% to see if it would help the BMS sort things out, still does it.
It doesn't do this for short trips (less than 3% used).
No errors have popped up.
Have had a few SW updates, I don't think they're correlate well enough to point the finger.

Any ideas on what to look at?

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[Henry Ford]

When you leave your house in the morning is the truck plugged in? Indoors? Do you have a Departure Time set? Is this behavior different than it was in the past under similar weather conditions?

My initial thought is battery is at peak operating temperature when you leave your house and less than peak operating temperature when you leave work necessitating battery warming on the way home. Or the cooler battery just has a bit less energy than a warmer battery with the same SOC and the system recalculates after start. Or it's a glitch.

Take a photo of the This Trip screen on the Sync screen for each trip. There might be a clue there.

 

[Zprime29]

When you leave your house in the morning is the truck plugged in? Indoors? Do you have a Departure Time set? Is this behavior different than it was in the past under similar weather conditions?

My initial thought is battery is at peak operating temperature when you leave your house and less than peak operating temperature when you leave work necessitating battery warming on the way home. Or the cooler battery just has a bit less energy than a warmer battery with the same SOC and the system recalculates after start. Or it's a glitch.

Truck is plugged in, inside garage (not heated). No departure settings used, is typically mild weather in winter so not needed. Morning is in 40s, afternoon in 60s. Definitely have not noticed this behavior the prior 2 winters.

My best guess is the new tires are somehow mixing up the energy usage calculations. They are supposed to be the same diameter, so not very confident in that guess.

 

[Mach Turtle]

Has your truck received updates recently? Our Mach-E seemed to change its Guess-o-Meter and Guess Gauge (battery percentage) algorithms after an update a few months ago. Its Guess Gauge now drops quickly after we leave our garage at home, as we're charging down a hill to the main road. After that, everything acts as one would expect. It usually drops about 2% for no apparent reason, and the effect is more noticeable in Winter (if you can call it that around here).

Since the percentage is estimated using various measurements (voltage, charge used, temperature, lunar phase?) we've become comfortable with the idea that it's accurate to within a few percent but certainly not as good as 1% in all situations. There are too many variables to get it perfectly right. But at least we don't have to worry about inaccuracies of 15-20% when gas in a tank sloshes around as we go up and down hills...

 

[Henry Ford]

Has your truck received updates recently? Our Mach-E seemed to change its Guess-o-Meter and Guess Gauge (battery percentage) algorithms after an update a few months ago. Its Guess Gauge now drops quickly after we leave our garage at home, as we're charging down a hill to the main road. After that, everything acts as one would expect. It usually drops about 2% for no apparent reason, and the effect is more noticeable in Winter (if you can call it that around here).

Since the percentage is estimated using various measurements (voltage, charge used, temperature, lunar phase?) we've become comfortable with the idea that it's accurate to within a few percent but certainly not as good as 1% in all situations. There are too many variables to get it perfectly right. But at least we don't have to worry about inaccuracies of 15-20% when gas in a tank sloshes around as we go up and down hills...

I've observed the GOM within 1-2% when coupled with Google Maps. Or I guess I should say Google Maps predicts the arrival SOC accurately. Maybe the GOM behavior was changed when it became compatible with Google Maps?

 

[roddiaz1]

Could you please give us the new tire specifics; Brand, Model, Size, etc. Thanks.

 

[Howard_Scott_Warshaw]

Let me guess. You drive (overall) uphill when going to work, and downhill coming home from work?

 

[Zprime29]

Could you please give us the new tire specifics; Brand, Model, Size, etc. Thanks.

Here's what I got, although mine didn't have the white lettering. Ordered from TireRack, installed at Discount Tire.

 

[Zprime29]

Let me guess. You drive (overall) uphill when going to work, and downhill coming home from work?

Reverse actually, 500ft drop in elevation between my house and work. Part of why I get slightly better efficiency in the morning vs return commute. The % drop occurs in seconds while I'm exiting the parking lot. It's really weird and definitely did not happen the previous two winters.

I finally got around to recording some data from my OBD adapter. I'll post tonight after I record the trip home. I'm starting the logs before I turn on the truck so hopefully it captures the drop.

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