grigo

Hi Everyone,
I wanted to share my experience with our new Q8 etron that we've had after we traded in our 2021 etron. The car is definitely more efficient and the bigger battery can help achieve more range. I have noticed in the last month or so since we've had the car the GOM shows less and less when I charge to 80%. At first I was seeing around 250 at 80% and now it is down to 220, which quite frankly isn't far off from my 2021 etron. Has anyone experienced less range than expected? At 100% I went from about 300+ miles down to 260, could it be a bad cell or the car balancing itself after driving? Let me know your thoughts, hopefully I don't have a bad group of battery cells.

Also, the AC is significantly more hungry and appears to be working harder to keep the cabin cooler and/or while DC Fast Charging.

nadrealista

you are not including another important data point(s). What is your short term and long term consumption average miles per/kWh...

GOM estimates are generally = battery capacity X short term efficiency in miles/kWh X battery state of charge...

in your case if 80% = 220 miles than your short term efficiency miles/kWh of your previous trip(s) should be 220/(106x0.8) = 2.59 miles/kWh, is it?

grigo

My short term efficiency usually ranges between 2.8 and 3.2kwh. I wonder where the disconnect is, unless something is truly wrong with the battery.

nadrealista

what were the last few short term efficiency numbers before you charged to 80% and got 220 miles GOM?

grigo

They were actually pretty good, between 2.8 and 3.0. I have attached the driving data just as you did.

nadrealista

interesting, what does your app show for battery charge level and range remaining right now?

grigo

I am at 59% SOC with 157mi of range indicated. Mind you I left the AC one when I turned the car off so give or take another 6-8 miles of range if the AC were turned off.

nadrealista

so lets do some quick math:
157/(106kWh X 0.59) = 2.51 miles/kWh so car thinks you will operate at this efficiency and giving you range of 157 for this level of charge..

your last drive was at 2.9 miles/kWh so you could expect to get 106 X 0.59 X 2.9 = 181 miles if you maintained that efficiency...

I wonder if using AC/heat while the car is off is not captured by short term efficiency but GOM accounts for it?

biff2bart

A/C shouldn't be that bad of a hit. Maybe someone cranked the heat in the rear climate control?

My kids did that when wee originally received our e-tron - shocked me to see the range plummet until I found out what was happening

Bill33525

I was out with another couple with the ladies in the back. One was cold and set the heat up to 90 to warm up. My consumption went from 350 to 620.
While on a trip up north when cold, for grins I kept moving the heat control from 70 into the 90's. The GOM dropped like a rock at every increase of the temperature control.
Reasonable A/C would be about 1 mile an hour if left on.