Range gets better over time and temp

[mkhuffman]

Of course efficiency - and thus ACTUAL range - changes with weather. That's not the concern I am expressing. My issue is that people are believing the guess-o-meter's expected range instead of doing the math based on the ACTUAL efficiency to compute the REAL range. Sometimes the GOM guesses "almost" correctly but many times it does not, and way too many people accept the GOM's guess as reality.

For those that are computing real range, it would be helpful to express that so newbies and others don't attribute the range statements to the GOM's SWAG*. Not explaining that reinforces the impression that the GOM is more accurate then it actually is.

* silly wild-ass guess

Back in December when I had my car for a month, I was of the same opinion. I posted in the forum about how inaccurate the GOM is. But now after more than 4 months, I have found the GOM to be fairly accurate.

It cannot predict if I am going to do a long 80 mph drive or a short 40 mph drive, and that is where I see the inaccuracies. It can't know what I am going to do but it does a pretty good job of using my past driving and weather conditions. The GOM range has consistently been what I have observed by calculating using other methods (such as using an OBDII scanner) as much as I hate to admit it after being so critical before.

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[Kamuelaflyer]

Back in December when I had my car for a month, I was of the same opinion. I posted in the forum about how inaccurate the GOM is. But now after more than 4 months, I have found the GOM to be fairly accurate.

It cannot predict if I am going to do a long 80 mph drive or a short 40 mph drive, and that is where I see the inaccuracies. It can't know what I am going to do but it does a pretty good job of using my past driving and weather conditions. The GOM range has consistently been what I have observed by calculating using other methods (such as using an OBDII scanner) as much as I hate to admit it after being so critical before.

I’ve found with mine that all it knows is the 10 miles of climb in rolling hills it has to get home. Its range estimate is based on that. 195 last winter and no more than 210 this summer on an extended range battery. Yet I’ve driven around this island several times (240 miles) and arrived back home with about 20% remaining from a full charge. GOM is worthless.

 

[timbop]

Back in December when I had my car for a month, I was of the same opinion. I posted in the forum about how inaccurate the GOM is. But now after more than 4 months, I have found the GOM to be fairly accurate.

It cannot predict if I am going to do a long 80 mph drive or a short 40 mph drive, and that is where I see the inaccuracies. It can't know what I am going to do but it does a pretty good job of using my past driving and weather conditions. The GOM range has consistently been what I have observed by calculating using other methods (such as using an OBDII scanner) as much as I hate to admit it after being so critical before.

Right, but that's the thing: it CAN be accurate but is often off by 20% or more depending on the situation. It tries to predict how, where, how fast, and the conditions you're going to drive. If you do exactly the same thing all the time in the same conditions it can guess reasonably accurately - but that's not the same thing as ALWAYS being "close enough to right". When you ask someone "hey who won the big game yesterday", the answer you're looking for isn't what the odds were in Vegas before the game but the actual score after the game. The oddsmakers are quite often right, but that's not the same thing as "who ACTUALLY won".

I’ve found with mine that all it knows is the 10 miles of climb in rolling hills it has to get home. Its range estimate is based on that. 195 last winter and no more than 210 this summer on an extended range battery. Yet I’ve driven around this island several times (240 miles) and arrived back home with about 20% remaining from a full charge. GOM is worthless.

For the last few months I have been doing a mix of short local driving and 100+ mile highway trips. Yesterday I got in my car with a 90% charge and the GOM said I could go 240mi - so an expected efficiency of 3.0 mi/kwh. It was already 60 degrees and going up to 70. 3 and a half driving hours later I got home having used 61% of the battery to go 200 miles for an efficiency of 3.7 mi/kwh with an average speed of 60mph. That's 25% better efficiency than predicted. If I told the story "my car gets only 264 mile range in 70 degree weather" that is a highly inaccurate representation, as the true 100% range achieved was around 325 miles. For full disclosure I do not have the update to 91kwh, so the calculations are based on 88kwh.

I realize my experience is an anecdote, but the point is that the GOM can never be absolutely correct because it has no way of knowing what will happen.

That's why we need to STOP using the GOM as the metric for discussion points of range and efficiency

 

[SnBGC]

Of course efficiency - and thus ACTUAL range - changes with weather. That's not the concern I am expressing. My issue is that people are believing the guess-o-meter's expected range instead of doing the math based on the ACTUAL efficiency to compute the REAL range. Sometimes the GOM guesses "almost" correctly but many times it does not, and way too many people accept the GOM's guess as reality.

For those that are computing real range, it would be helpful to express that so newbies and others don't attribute the range statements to the GOM's SWAG*. Not explaining that reinforces the impression that the GOM is more accurate then it actually is.

* silly wild-ass guess

I track my range pretty well.
It will be difficult for most people unless they use a scan tool to see the actual readings because the kWh to empty vs S.O.C. ratio varies day to day. For example, the kWh to empty today is only 86 @100% I think the GOM might use the static 88kWh value though? Not sure.

As best as I can tell from my data, I average about 3.31 mi/kWh. So at 88 kWh full charge I can expect over 290 miles of range to empty. However, I am only starting my day with 86 kWh today so maybe only 285 miles is reasonable?

GOM thinks 294 today so it is optimistic for sure.

 

[JSeis]

The high mile ranges really speaks to slow dilly dallying driving 35 mph or less. Any slowpoke can push mi/KWh well over 4.0

 

[kkriskal]

AWD Extended range

Ok, that is still very good efficient driving from your end because you are getting 37 miles over EPA so real cool

 

[SnBGC]

Back in December when I had my car for a month, I was of the same opinion. I posted in the forum about how inaccurate the GOM is. But now after more than 4 months, I have found the GOM to be fairly accurate.

It cannot predict if I am going to do a long 80 mph drive or a short 40 mph drive, and that is where I see the inaccuracies. It can't know what I am going to do but it does a pretty good job of using my past driving and weather conditions. The GOM range has consistently been what I have observed by calculating using other methods (such as using an OBDII scanner) as much as I hate to admit it after being so critical before.

My GOM is pretty close too. It's on the optimistic side most days though. Maybe 3% off from what I actually achieve. Well within range for my needs for sure.

 

[mkhuffman]

I’ve found with mine that all it knows is the 10 miles of climb in rolling hills it has to get home. Its range estimate is based on that. 195 last winter and no more than 210 this summer on an extended range battery. Yet I’ve driven around this island several times (240 miles) and arrived back home with about 20% remaining from a full charge. GOM is worthless.

Have you tried resetting your diving history to see if it recalibrates to to your actual diving habits?

Probably no GOM is ever going to be as accurate as we want. We know our ICE car range estimates are usually wrong. And Tesla just shows you EPA range (so I heard) so you know that isn't accurate.

It is interesting that my GOM is fairly accurate while others are not. Maybe that will change this summer. I have not noticed the big jumps in range predictions that others have seen as the weather gets warmer.

 

[timbop]

If Ford would just do what the Bolt did and show a min/max/best guess it would be much more clear to people that the number is not an ABSOLUTE value but an approximation.

Exhibit A: https://www.macheforum.com/site/thr...did-the-dealership-give-me-a-std-range.15678/

 

[Kamuelaflyer]

Have you tried resetting your diving history to see if it recalibrates to to your actual diving habits?

Probably no GOM is ever going to be as accurate as we want. We know our ICE car range estimates are usually wrong. And Tesla just shows you EPA range (so I heard) so you know that isn't accurate.

It is interesting that my GOM is fairly accurate while others are not. Maybe that will change this summer. I have not noticed the big jumps in range predictions that others have seen as the weather gets warmer.

Yes I have. It goes to 240 then immediately starts reducing to 200 miles. The GOM overly weights your most recent drive apparently. My lifetime miles/kWh is 3.7. That translates to 325 miles of range. I’d not want to push that though, you got still need the energy to climb the hills to get home.

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