Range estimate immediately after resetting

[MarkWill]

I posted a similar question in a Facebook group but I was overwhelmed with responses educating me about range (how I drive, temperatures, it's just an estimate, etc). My question is NOT about range specifically - it's about the impact of a reset on the range estimate.

So let me narrow this down to a very specific question.

If I have an Extended Range AWD Mach-E and I reset my trip history (i.e. there is no driving history) and I have an 80% charge what would you expect the range estimate to be?

To reiterate, this is not a question about how to increase range, how the number presented is just a guess or any of that. I am asking about how the car would determine the figure to display IMMEDIATELY after a reset ( therefore with no history) and with the car not having yet been driven a mile, since the reset.

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[ack154]

If you reset everything, I'd expect an 80% charge to be whatever 80% of the 100% charge says. And I'd also expect the 100% charge to be really close to whatever the EPA estimate is for your config. But that doesn't mean any of that is exact or consistent.

 

[Teslaeata]

I posted a similar question in a Facebook group but I was overwhelmed with responses educating me about range (how I drive, temperatures, it's just an estimate, etc). My question is NOT about range specifically - it's about the impact of a reset on the range estimate.

So let me narrow this down to a very specific question.

If I have an Extended Range AWD Mach-E and I reset my trip history (i.e. there is no driving history) and I have an 80% charge what would you expect the range estimate to be?

To reiterate, this is not a question about how to increase range, how the number presented is just a guess or any of that. I am asking about how the car would determine the figure to display IMMEDIATELY after a reset ( therefore with no history) and with the car not having yet been driven a mile, since the reset.

I reset mine only a few time as I found it a pointless exercise because it soon reverts to real-world range according to ambient temp my driving style and all I’m sure you’ve already been inundated with.

Following a reset I found it to read around 379, one time below and another 384 at 100% charge as I seem to remember.

Mine is ER RWD June ‘21 Premium with stated range of “up to 379 miles”.

Does that help?

 

[RickMachE]

80% of EPA estimate, adjusted for current temperatures.

 

[MarkWill]

If you reset everything, I'd expect an 80% charge to be whatever 80% of the 100% charge says. And I'd also expect the 100% charge to be really close to whatever the EPA estimate is for your config. But that doesn't mean any of that is exact or consistent.

Agreed. In the absence of any driving history, I'd expect to see 80% of 290 (Extended, AWD) = around 232.

But I am seeing much lower (around 195 after a reset). I don't really understand how it comes up with that. This is in a garage with outside temperatures in the mid-50s, so pretty mild.

 

[RickMachE]

Agreed. In the absence of any driving history, I'd expect to see 80% of 290 (Extended, AWD) = around 232.

But I am seeing much lower (around 195 afrer a reset). I don't really understand how it comes up with that.

W-E-A-T-H-E-R.

 

[AliRafiee]

There are two things you can reset.
The trip does nothing for range estimation. But this one helps.

 

[MarkWill]

Yes, that's what I have reset (to clear the full driving history).

 

[MarkWill]

W-E-A-T-H-E-R.

Everyone suggests the weather thing...but immediately reducing the estimate by 100 miles on a reset (as compared to the EPA figure for this car), with the car in a garage with outside temperatures in the upper to mid 50s? That doesn't seem like the explanation to me

 

[MarkWill]

I reset mine only a few time as I found it a pointless exercise because it soon reverts to real-world range according to ambient temp my driving style and all I’m sure you’ve already been inundated with.

To clarify why I am asking...

This part of an investigation I am doing about the range we are seeing on our car. Obviously it's meaningless to ask "What range should I be getting", since there are so many variables. But, given what I know (driving habits, terrain, temperatures, etc) our 2024 Mach-E Premium Extended AWD seem to get pretty poor range.

To help research this, I decided to at least temporarily remove driving history as a factor. So, as a one-off, I thought I'd reset and then track carefully from there.

I had expected that, without any driving history, the car would show a range at least roughly in line with EPA numbers. For me that would mean around 290 * 80% = 232, or thereabouts, since it has no other data available.

But,, to my surprise, I see a number of 193 miles and I can't understand why or how it would reach that figure. This after I reset, the car is in the garage and has not been driven.

Now, all that said. while I think this is REALLY unlikely, someone suggested I check I actually DO have an extended battery. All the documentation and the VIN suggests I do.

But if you take the STANDARD range AWD and do the same math....you get very close to 193

 

[Jgg181]

To clarify why I am asking...

This part of an investigation I am doing about the range we are seeing on our car. Obviously it's meaningless to ask "What range should I be getting", since there are so many variables. But, given what I know (driving habits, terrain, temperatures, etc) our 2024 Mach-E Premium Extended AWD seem to get pretty poor range.

To help research this, I decided to at least temporarily remove driving history as a factor. So, as a one-off, I thought I'd reset and then track carefully from there.

I had expected that, without any driving history, the car would show a range at least roughly in line with EPA numbers. For me that would mean around 290 * 80% = 232, or thereabouts, since it has no other data available.

But,, to my surprise, I see a number of 193 miles and I can't understand why or how it would reach that figure. This after I reset, the car is in the garage and has not been driven.

Now, all that said. while I think this is REALLY unlikely, someone suggested I check I actually DO have an extended battery. All the documentation and the VIN suggests I do.

But if you take the STANDARD range AWD and do the same math....you get very close to 193

Simple to test for that..

if when you charge from 20% or less, if the ‘full’ charge is less than 70 kwhs, you have pretty much solved the mystery.

 

[Teslaeata]

To clarify why I am asking...

This part of an investigation I am doing about the range we are seeing on our car. Obviously it's meaningless to ask "What range should I be getting", since there are so many variables. But, given what I know (driving habits, terrain, temperatures, etc) our 2024 Mach-E Premium Extended AWD seem to get pretty poor range.

To help research this, I decided to at least temporarily remove driving history as a factor. So, as a one-off, I thought I'd reset and then track carefully from there.

I had expected that, without any driving history, the car would show a range at least roughly in line with EPA numbers. For me that would mean around 290 * 80% = 232, or thereabouts, since it has no other data available.

But,, to my surprise, I see a number of 193 miles and I can't understand why or how it would reach that figure. This after I reset, the car is in the garage and has not been driven.

Now, all that said. while I think this is REALLY unlikely, someone suggested I check I actually DO have an extended battery. All the documentation and the VIN suggests I do.

But if you take the STANDARD range AWD and do the same math....you get very close to 193

I never get more than 270 miles in summer and around 240 winter for an ER RWD Premiun that “could” return 379 miles. Right from day 1. Not that much different now.

Did you run a check on your HVB SoH? That’s usually a better yardstick of how your battery’s doing, eliminates all the imponderables affecting range.

And then a cell by cell Voltage & kWh health check?

My SoH is 94% at 40mths just under 100k miles and difference between each cell’s Voltage & kWh rating is five eights of nothing so still a pretty healthy battery pack.

 

[Mach-Lee]

Agreed. In the absence of any driving history, I'd expect to see 80% of 290 (Extended, AWD) = around 232.

But I am seeing much lower (around 195 after a reset). I don't really understand how it comes up with that. This is in a garage with outside temperatures in the mid-50s, so pretty mild.

There is a STRONG temperature influence in the calculation which you underestimate.

There is more biasing at lower SoC than at 100% in the latest software.

If you are trying to determine the battery health, you need to use a scan tool to read the SoH parameter, you can’t use the range figure.

 

[MarkWill]

There is a STRONG temperature influence in the calculation which you underestimate.

...

If you are trying to determine the battery health, you need to use a scan tool to read the SoH parameter, you can’t use the range figure.

Can you clarify what you mean by my under-estimation? At this point i am just trying to understand if I have a problem here, so certainly open to all ideas. But, immediately after a reset, is the suggestion that temperature alone could explain why the range displayed might be 40 or miles less than "optimal"?

The outside temperatures were in the mid-50's at the time and, in the well-insulated garage, I would imagine the temperatures around the car was upwards of 60. Perhaps I am misunderstanding, but that doesn't seem like the sort of temperature that would result in such a significant drop in that initial estimate, no? I was expecting (significant) range drops to become evident only at lower temperatures than that.

But, for now, I remain surprised at the 193 figure (even if 60 degrees might have some impact on that estimate), so I am just trying to broaden my understanding before digging deeper.

As to the scan tool, yes I am looking into that (I have two new EVs so need to understand if there are any implications for the device and/or the software I might consider, to get the most bang for my buck ).

To date - and, respectfully, even allowing for your qualifier about temperatures - it is not clear why I am seeing a range of 193 miles after a reset, at a "comfortable" temperature and for an extended battery.

Thank you again.

 

[Mach-Lee]

Can you clarify what you mean by my under-estimation? At this point i am just trying to understand if I have a problem here, so certainly open to all ideas. But, immediately after a reset, is the suggestion that temperature alone could explain why the range displayed might be 40 or miles less than "optimal"?

There is no problem. Warm up the battery pack to 75ºF, charge it to 100%, then reset the range figure. You'll be happier. Ford made the GOM to show essentially full EPA range at 100% to satisfy your type. The displayed state of charge is not the actual state of charge, so when it displays 80% you could be some amount less than that which varies depending on the hysteresis algorithm.

The outside temperatures were in the mid-50's at the time and, in the well-insulated garage, I would imagine the temperatures around the car was upwards of 60. Perhaps I am misunderstanding, but that doesn't seem like the sort of temperature that would result in such a significant drop in that initial estimate, no?

Yes, you are misunderstanding. If the ambient temperature is less than about 68ºF, there is a huge drop the range figure as a result of the lowered temperature. That's just how Ford's calculation works. The actual drop in range is not that bad. It is conservative.

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