Optimistic range estimation.

[CuriousIslander]

It’s is likely that the long term average has the most influence on inflating the predicted range you can see.
Resetting both counters is always advisable before taking on a long trip, I find.
Let’s just say, you have 200 miles stored on your accumulative counter and the majority of the miles shown, have been done driving carefully or in town.
Not heater or use of the A/C over these journeys.
Then the predicted range will be based and representative of the evidence that is shown.
You leave the trips un- rest thinking you will achieve the estimated range displayed.
However, the long range trip includes fast roads and the weather conditions are not favourable.
Strong winds / rain and the heater is in use.
The car is now learning a different situation on how the car is behaving.
It adjusts the predicted range on the fly.
You are now wondering why your range is falling more quickly than you expected ???,
This can catch you out, because you based your range on the previous reported prediction.
Reset the trips before taking on a longer ( unknown ) trip is a safer option in my opinion.

I don't reset the trips. Isn't it more accurate to calculate probable range based on your actual miles driven relative to percentage battery used? This is what I do, For example, since my last charge (to 88% at home) I have driven 125 miles and used 49% of the battery. This gives me an estimate of about 250 miles for a full charge. I tend to notice what happens every 10%, ie how far I have gone after 10% use, 20% use and so on. I find this very useful, and it works on longer trips as well as short trips.

 

[Lovemyev]

I don't reset the trips. Isn't it more accurate to calculate probable range based on your actual miles driven relative to percentage battery used? This is what I do, For example, since my last charge (to 88% at home) I have driven 125 miles and used 49% of the battery. This gives me an estimate of about 250 miles for a full charge. I tend to notice what happens every 10%, ie how far I have gone after 10% use, 20% use and so on. I find this very useful, and it works on longer trips as well as short trips.

Each to their own I guess, what ever works for you.
Inflated figures are fine as long as you are able to repeat and conduct the same journey, in the same weather conditions, all of the time.
If any one of these elements changes, then your predicted figure will be inaccurate.
If you take on a new unknown journey in difference weather conditions with HVAC running etc and you believe the predicted range as being 100% achievable, then you may come up short.

 

[CuriousIslander]

Each to their own I guess, what ever works for you.
Inflated figures are fine as long as you are able to repeat and conduct the same journey, in the same weather conditions, all of the time.
If any one of these elements changes, then your predicted figure will be inaccurate.
If you take on a new unknown journey in difference weather conditions with HVAC running etc and you believe the predicted range as being 100% achievable, then you may come up short.

What you say is very true, but I think you misunderstand how I do the calculations. The advantage of calculating potential range in the way I do is that it is not a forecast (which then becomes a target), but extrapolates from actual distances driven, and is calculated "after the event" so that it is range actually achieved.
I have kept charging records for the car since I bought it last August, (yes I am a nerd), and in the period August to March I drove a total of 2846 miles consuming 1273% of battery. This gives me an average figure of 223 miles per full charge. The lowest was 194 miles in a cold spell in November, and the highest was 247 miles in a warm spell in March.
Since April 1st (when I reset the trips for the summer months) I have recharged 7 times, and on four of those occasions I have achieved extrapolated ranges in the 240s, for instance using 68% of the battery to cover 166 miles (244 miles for a full charge). Admittedly all of these were local driving and the weather has been good, which helps. I am about to charge up again tomorrow as the battery is down to 28% and on this occasion I have driven 156 miles since I last charged and used 60% of the battery (down from 88%). This gives me a "whole battery" range of 260 miles (assuming that I were to run the battery down to zero and use the same rate of consumption)!! The other 3 charges were over a 400+ mile holiday round trip with 4 adults on board, plus luggage, driving at motorway speeds. Using my method of calculation I achieved extrapolated ranges of 211, 199 and 214 miles (I used only some of this last charge to complete my return journey), all of which I am very happy with and are in line with my expectations. Over the period from April 1st I have so far driven 1055 miles and used 456% of the battery. This gives me an overall average figure of 231 miles per full charge.
It seems to me that the results I am getting are consistent over time. As I said at the outset, this analysis does not produce a predicted range (which you then try to achieve) but instead looks backwards to see what range has actually been achieved, and consequently I feel that I can have a greater confidence in the data.
I should perhaps point out that all of this is in driving a standard range MG5, not the long range version, and I always drive in Eco mode, with Kers 3. I am more than happy with the performance of my car. The data also seems reasonably consistent with what the car is showing - aggregated figure of 4.5 miles per kwh since April 1st. 4.5*48.8 (usable battery)=220 miles approx, 4.5 *52 (full capacity)=234 miles, and I am actually getting about 231 miles equivalent overall so far.
I am quite happy that my method of calculating the car's performance is as good as any other, and does not rely on the GOM or any other forecasts.

 

[Deleted member 7134]

Not necessarily ? 250 miles done with 24% battery left ?

 

[Lovemyev]

What you say is very true, but I think you misunderstand how I do the calculations. The advantage of calculating potential range in the way I do is that it is not a forecast (which then becomes a target), but extrapolates from actual distances driven, and is calculated "after the event" so that it is range actually achieved.
I have kept charging records for the car since I bought it last August, (yes I am a nerd), and in the period August to March I drove a total of 2846 miles consuming 1273% of battery. This gives me an average figure of 223 miles per full charge. The lowest was 194 miles in a cold spell in November, and the highest was 247 miles in a warm spell in March.
Since April 1st (when I reset the trips for the summer months) I have recharged 7 times, and on four of those occasions I have achieved extrapolated ranges in the 240s, for instance using 68% of the battery to cover 166 miles (244 miles for a full charge). Admittedly all of these were local driving and the weather has been good, which helps. I am about to charge up again tomorrow as the battery is down to 28% and on this occasion I have driven 156 miles since I last charged and used 60% of the battery (down from 88%). This gives me a "whole battery" range of 260 miles (assuming that I were to run the battery down to zero and use the same rate of consumption)!! The other 3 charges were over a 400+ mile holiday round trip with 4 adults on board, plus luggage, driving at motorway speeds. Using my method of calculation I achieved extrapolated ranges of 211, 199 and 214 miles (I used only some of this last charge to complete my return journey), all of which I am very happy with and are in line with my expectations. Over the period from April 1st I have so far driven 1055 miles and used 456% of the battery. This gives me an overall average figure of 231 miles per full charge.
It seems to me that the results I am getting are consistent over time. As I said at the outset, this analysis does not produce a predicted range (which you then try to achieve) but instead looks backwards to see what range has actually been achieved, and consequently I feel that I can have a greater confidence in the data.
I should perhaps point out that all of this is in driving a standard range MG5, not the long range version, and I always drive in Eco mode, with Kers 3. I am more than happy with the performance of my car. The data also seems reasonably consistent with what the car is showing - aggregated figure of 4.5 miles per kwh since April 1st. 4.5*48.8 (usable battery)=220 miles approx, 4.5 *52 (full capacity)=234 miles, and I am actually getting about 231 miles equivalent overall so far.
I am quite happy that my method of calculating the car's performance is as good as any other, and does not rely on the GOM or any other forecasts.

Thank you for the detailed report on how you have worked out your range, it was a interesting read.
As you openly admit, you are likely to be the 1% of the people who carry out this type of practice.
For the remaining 99% of drivers, I think resetting the trips is about as far as they are likely to go.
?