E-Golf (35kWh) consumption too high at lower speeds
🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/report-a-bug/e-golf-35kwh-consumption-to-high-at-lower-speeds/
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The reference consumption may be fine, but at lower speed this thing is more efficient than the planner is currently assuming.
If I set 160Wh/km @ 110kmh the assumed consumption is only around 5wh/km lower when driving on roads with speeds around 50-80kmh.
I've done trips in temps around 0-5C and only used 140-145Wh/km. Maybe heat-pump is not considered in the profile? Or is planner only looking at speed limits and assuming you can drive at that speed constantly? That is not going to work many places with a default 80kmh limit, but winding roads where the practical limit is more like 60-65kmh on average.
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Comments7
Jan Tillung
Nov 11, 2025
So… how many months before someone is actually looking at this and fixing it?
Jan Tillung
Apr 28, 2025
More trip data for troubleshooting this problem.
Trip leg 1:
https://abetterrouteplanner.com/?plan_uuid=8de70380-fa9e-4728-8db6-6a692f48e1b0
Left with 95% and arrived with 20%. Car reported 178km at 57kmh average using 133Wh/km.
Planning this trip with the automatically calculated consumption ABRP says I will use about 169Wh/km for the same trip using 5C and dry conditions.
Leg 2:
https://abetterrouteplanner.com/?plan_uuid=e8d43e54-4331-44e4-95ca-bf323e5687f0
Charged to 91-92% while waiting for Lavik-Oppedal ferry and drove back to Tesla charger at Voss Handelshus. Arrived with around 30%. Car says 134km at 47kmh average using 137Wh/km.
ABRP claims 184Wh/km for this leg which makes it force a stop to charge that is obviously not needed.
I didn’t capture the numbers since charging immediately at Voss Handelshus which may explain the low average speed. Pretty sure it was at least 50 on arrival.
A large portion of this leg (between E39 and E16 on 569) is done on very narrow and winding road with twists and turns down in the 30-40 kmh range.
Keep in mind the car counts when stationary and I did keep the car on for a few minutes before entering the ferry at Vangsnes and while waiting to exit at Dragsvik. Same as I was waiting at Lavik and before exiting ferry at Oppedal.
The router also erroneously routes you on shore at Hella for a loop. This is not real. If the ferry is not full you just do a U-turn on the ferry when going between Vangsnes and Dragsvik ferry terminals.
ABRP is set to 97% reference speed for the calculations btw.
Jan Tillung
Apr 6, 2025
This is getting crazy. My reference consumption keep increasing even though my drives are at low consumption.
The logging is completely broken in newer ABRP.
Tunnels completely breaks the logging setting speed to 0 and consumption so like 120-140k Wh/km.
Jan Tillung
Feb 28, 2025
Anyone going to look at this? ABRP is really nice in e-Golf as it lacks the battery % display, but I’m not going to keep paying a monthly fee to support ABRP if this critical bug is not fixed.
Jan Tillung
Feb 20, 2025
Reply via email dated
October 24, 2024 at 11:39 PM
Hi,
Some more data for you guys...
https://abetterrouteplanner.com/?plan_uuid=32641c3a-38d6-4c98-ae92-c342dcde267a
Drove this in 8-11C with wet roads but no rain. Consumption was 130Wh/km at roughly 65km/h average speed and HVAC set at 23C.
ABRP claims 167Wh/km with road conditions manually set at 11C and dry roads, reference speed at 90% and using reference consumption at 189Wh/km.
I have to set reference consumption manually to below 130Wh/km to have ABRP actually plan for 130Wh/km that I got.
Reference is supposed to be at 110km/h no? Clearly something is wrong.
Hope this helps
Jan Tillung
Feb 20, 2025
Reply via email dated
October 22, 2024 at 9:28 PM
Hi,
The main issue is the profile is not reducing consumption enough from reference when driving slowly.
The planner seem to be expecting below speed limit driving automatically depending on the road. If I click on segments in the plan it will clearly show expected speeds.
And the speed ABRP calculate seem to be almost spot on. So even if I drive below the speed limit that is already expected.
So this means ABRP already expects below speed limit in some areas, so that can't explain it.
As I said in my previous email, reducing the reference speed doesn't make enough of a difference.
If I reduce the reference by 10-20% that would throw off the expected time to destination. It is also not reducing the expected consumption nearly enough.
If expected consumption is 170Wh/km and I reduce reference speed by 15% the drop is only 5-10Wh/km. That is still way off the real consumption of 120-130Wh/km.
The trip to Fagernes that I told you about was following the speed limit +5 if you read it thoroughly. Getting 70-75kmh average on roads with mostly 80 and some 50-70 dotted around is pretty normal. Yet ABRP was off by massive amount on consumption.
Even on motorways you'll never been able to follow the limit if there is traffic.
The big problem is that ABRP says my reference consumption should be 189Wh/km based on my recorded driving. Confidence is 75, 86, 70. But then doesn't reduce consumption enough as speeds reduce. It's still expecting 170Wh/km at 80km/h.
Example: https://abetterrouteplanner.com/?plan_uuid=39411250-27df-4aa1-bd98-72f20828f728
With above reference consumption (189): If I set dry conditions and 22C it will be 145Wh/km which is just way off. In that condition I do this drive in roughly the same time, so speed is fine, but at 125Wh/km or below. To get ABRP even close to the real world I have to set reference consumption to 145-150Wh/km.
If I then use 145Wh/km in reference and set temps to 11C, still dry condition, expected consumption then says 145Wh/km.
This is closer but still off. I recently did a trip in roughly those temps but with some drizzle so roads were wet and got 142Wh/km.
How is this automatic reference speed set by ABRP even close to accurate!? The reference speed is supposed to be at 110km/h and there no way the e-Golf do <150Wh/km at that speed. I'm sure 180-190Wh/km is more normal at 110km/h, I don't know as I don't have such luxury around here 😄
But then the consumption at <80km/h is not 160-170Wh/km if conditions are the same. It's more like 140-150Wh/km. And drop speed to 60 and consumption drops even more to <130Wh/km as I mentioned above.
Bottom line, the expected consumption do not drop enough with reduced speeds if everything else is the same.
It has very little to do with driving below the speed limit as the time to destination in plan is pretty accurate.
Katya S.
Feb 20, 2025
Reply via email dated
October 22, 2024 at 5:08 PM
Hi Jan,
This seems to be caused by us not knowing that you’re driving slower than the speed limit. Looking at the settings of the linked plan, the reference speed is set to 100%.
I fully understand that changing the reference speed is not the ultimate solution since it impacts all speeds throughout the plan, but at the moment, we are not able to provide a setting that caters to this specific use-case.
What we do have in place is a curve speed estimator, but it is in need of improvement.
If you have a specific drive where you need to lower the speed often in order to handle curves, please let me know the date and timeframe and we can investigate if the estimates are possible to improve.
It could also have to do with the HVAC part of the calibrated model, but this we’re also actively working on improving.