Battery Range and FSD question

[That Beast Mode]

So for those of you out there that know the math on these things better than I do. Do you think there is an issue with my battery? I took the truck to my local SC today, it is 19mi each way. I left with 64% battery and returned with 47%. I drove there on chill mode, normal highway speeds 60-65, im not a lead foot. The truck was in service for about an hour just to factor that into the equation. To lose 17% charge over 38mi seems excessive to me. Based on my rough calculations it gives me a range of about 220mi. Shouldn't I be getting closer to 300mi with normal driving?

My next question, is there a "right" way to turn FSD off? I usually push the same button i use to turn it on. It gives me the pop up of FSD was deactivated, what happened? Nothing happened, I just wanted to take over. Just wondering if theres a proper way to deactivate it where it doesn't think something is wrong.

Thanks.

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[Facedown]

The only way I’ve found to avoid the message is to ”end trip” , wait about 5 seconds, and then push down on the scroll wheel.

 

[Crissa]

Every trip will be different... But you can in extreme situations use 2% an hour if the AC or heat is on; the average speed for range tests is 50 mph, not 65 mph; then you have hills and start-stop is a larger portion of a shorter trip.

If there was battery conditioning, that'll use power, too. No telling what they were doing when testing your truck, too.

-Crissa

 

[mongo]

So for those of you out there that know the math on these things better than I do. Do you think there is an issue with my battery? I took the truck to my local SC today, it is 19mi each way. I left with 64% battery and returned with 47%. I drove there on chill mode, normal highway speeds 60-65, im not a lead foot. The truck was in service for about an hour just to factor that into the equation. To lose 17% charge over 38mi seems excessive to me. Based on my rough calculations it gives me a range of about 220mi. Shouldn't I be getting closer to 300mi with normal driving?

My next question, is there a "right" way to turn FSD off? I usually push the same button i use to turn it on. It gives me the pop up of FSD was deactivated, what happened? Nothing happened, I just wanted to take over. Just wondering if theres a proper way to deactivate it where it doesn't think something is wrong.

Thanks.

Short drives and higher speeds are less efficient.
Truck being awake during service impacted it too. I wouldn't worry. The energy page shows where it went.

When I button press out of FSD, I'll leave a voice memo like "manual navigation"

 

[That Beast Mode]

The only way I’ve found to avoid the message is to ”end trip” , wait about 5 seconds, and then push down on the scroll wheel.

Does this work where you don't get the notification? I'd like for the GPS to stay navigating, sometimes I just want to take over.

 

[That Beast Mode]

Every trip will be different... But you can in extreme situations use 2% an hour if the AC or heat is on; the average speed for range tests is 50 mph, not 65 mph; then you have hills and start-stop is a larger portion of a shorter trip.

If there was battery conditioning, that'll use power, too. No telling what they were doing when testing your truck, too.

-Crissa

No I know every trip is different, the reason I asked is this was a relatively routine, un-eventful trip on a somewhat flat highway. No massive hill climbs, mostly highway minus a mile or so on and off the ramps. I don't think the battery was conditioning, it didn't have any notification, although the service center does have superchargers. It was nothing out of the ordinary which is why I thought the drain was quite excessive.
As for the service center visit, they replaced one of contrails, no heavy diagnostics involved.

 

[That Beast Mode]

Short drives and higher speeds are less efficient.
Truck being awake during service impacted it too. I wouldn't worry. The energy page shows where it went.

When I button press out of FSD, I'll leave a voice memo like "manual navigation"

I didn't check the energy page, I'll give it a look and see if it has any more info. Thanks.

 

[Facedown]

Does this work where you don't get the notification? I'd like for the GPS to stay navigating, sometimes I just want to take over.

If you exit navigation and wait before cancelling FSD then you don’t get the notification. The only problem is that your map directions are gone. I’m hoping that they just get rid of the reporting feature with version 14. Tesla has to be getting close to the point where they generate synthetic training data and no longer need our help regarding disengagements. It is often the case for me, too that I turn off FSD just because I like to drive sometimes.

 

[TJCJr9999]

So for those of you out there that know the math on these things better than I do. Do you think there is an issue with my battery? I took the truck to my local SC today, it is 19mi each way. I left with 64% battery and returned with 47%. I drove there on chill mode, normal highway speeds 60-65, im not a lead foot. The truck was in service for about an hour just to factor that into the equation. To lose 17% charge over 38mi seems excessive to me. Based on my rough calculations it gives me a range of about 220mi. Shouldn't I be getting closer to 300mi with normal driving?

My next question, is there a "right" way to turn FSD off? I usually push the same button i use to turn it on. It gives me the pop up of FSD was deactivated, what happened? Nothing happened, I just wanted to take over. Just wondering if theres a proper way to deactivate it where it doesn't think something is wrong.

Thanks.

I have 16k miles on my beast, and keep track of every electron that goes into my battery. For driving efficiency I monitor wh/mile and in retiree mode I get around 400 watt hours/mile, in "Jersey Cheese cutter" mode it goes up over 600 watt hours/mile. Range wise, I monitor charge mileage vs %, so at 80% charge limit I have been getting ~240 miles, which hasn't dropped too far, down ~238 or so. At 90% for long trips charge goes to 270 miles or so, and I haven't seen any battery degradation yet.......

 

[ABILISK]

I’ll just quote myself on this topic for your future reference.

You left the house with 78.72 kWhs and returned after driving 38 miles and idling for an hour (maybe with cabin overheat protection and sentry mode on, maybe not since it was likely in service mode) with 57.81 kWhs in your pack. Those 38 miles cost you 20.91 kWhs, which means your Wh/mi was 550.26 (which on a full charge would give you a 223.64 mi range, so that aligns with your estimate).

If you’re able to find that trip in your history and verify that number, your battery is working as it should, just maybe not being the most efficient. I will say service appointments are hard on your range because I’m sure the doors were open the whole time while they were replacing your cantrail and the A/C was blasting.

The equation for calculating your real world range: battery pack size (in kWh) divided by kWh/mi. Finding kWh/mi is easy. Divide your Wh/mi by 1,000. For me, that’s 0.479.

CT has a 123 kWh battery pack. Take my lifetime usage: 123/0.479 = 256.79 mi range. Although I only charge to 80%, only giving me 98.40 usable kWhs… 98.40/0.479 = 205.43 mi range.

Say I’m on a road trip and I’m at, say, 64% state of charge. Now I find 64% of 123 kWh (78.72), then do the math. 78.72/0.479 = 164.34 miles. If the supercharger is 170 miles away, I’m in trouble. You can play with the numbers and find out what Wh/mi you’ll need to get there. 78.72/0.463 = 170.02, so I’d certainly need to keep it below 463 Wh/mi to make it.

Knowing this is particularly useful when towing or hauling heavy loads. It’s not particularly hard to pull over 1,000 Wh/mi when doing truck stuff. If you’re someone who keeps your screen/app on miles instead of percentage, that number will fall like a ton of bricks and be nowhere close to real. Percentage always is.

Here are the numbers to shoot for if you want the actual quoted ranges:
Beast A/S (320 mi range): 384 Wh/mi
Beast A/T (301 mi range): 408 Wh/mi
AWD A/S (325 mi range): 378 Wh/mi
AWD A/T (314 mi range): 391 Wh/mi

Math is our friend!

 

[Gaximus]

So for those of you out there that know the math on these things better than I do. Do you think there is an issue with my battery? I took the truck to my local SC today, it is 19mi each way. I left with 64% battery and returned with 47%. I drove there on chill mode, normal highway speeds 60-65, im not a lead foot. The truck was in service for about an hour just to factor that into the equation. To lose 17% charge over 38mi seems excessive to me. Based on my rough calculations it gives me a range of about 220mi. Shouldn't I be getting closer to 300mi with normal driving?

My next question, is there a "right" way to turn FSD off? I usually push the same button i use to turn it on. It gives me the pop up of FSD was deactivated, what happened? Nothing happened, I just wanted to take over. Just wondering if theres a proper way to deactivate it where it doesn't think something is wrong.

Thanks.

Tesla wants to know why you wanted to take over. Not just to improve mistakes of FSD, but to make it so that you don’t want to do that. I take over all the time when the road goes from 1-2 lane or to choose a better lane at a stop light. If FSD did this I wouldn’t want to disengage.
What happened?
Guy next to me in the Vet wants to race.

 

[Alexander S.]

So for those of you out there that know the math on these things better than I do. Do you think there is an issue with my battery? I took the truck to my local SC today, it is 19mi each way. I left with 64% battery and returned with 47%. I drove there on chill mode, normal highway speeds 60-65, im not a lead foot. The truck was in service for about an hour just to factor that into the equation. To lose 17% charge over 38mi seems excessive to me. Based on my rough calculations it gives me a range of about 220mi. Shouldn't I be getting closer to 300mi with normal driving?

My next question, is there a "right" way to turn FSD off? I usually push the same button i use to turn it on. It gives me the pop up of FSD was deactivated, what happened? Nothing happened, I just wanted to take over. Just wondering if theres a proper way to deactivate it where it doesn't think something is wrong.

Thanks.

You will have 300 miles range from 100% to 0% of battery usage and speed not higher than 55-65 mph, and you kill your battery.

From 80% to 20% battery range 200 miles is excellent.
In FSD power consumption is higher.

 

[Jager]

Chill mode softens and elongates throttle response, but it does not directly influence efficiency.

Most drivers are not very efficient, even when they think they are driving gently.

The Energy App is your friend when it comes to understanding your energy consumption. Among other things, it will quickly reveal that very few roads are actually flat.

 

[That Beast Mode]

I’ll just quote myself on this topic for your future reference.

You left the house with 78.72 kWhs and returned after driving 38 miles and idling for an hour (maybe with cabin overheat protection and sentry mode on, maybe not since it was likely in service mode) with 57.81 kWhs in your pack. Those 38 miles cost you 20.91 kWhs, which means your Wh/mi was 550.26 (which on a full charge would give you a 223.64 mi range, so that aligns with your estimate).

If you’re able to find that trip in your history and verify that number, your battery is working as it should, just maybe not being the most efficient. I will say service appointments are hard on your range because I’m sure the doors were open the whole time while they were replacing your cantrail and the A/C was blasting.

Thanks Abilisk, this is the kind of info and answer I was looking for - basically the math. Isn't 223 mi on a full charge pretty low? I don't know the actual range on a full charge because I've never charged it to 100%. When I get home I'm going to take a look at the energy tab and see. I haven't used the truck since the service yesterday so it should be the last trip data. Cabin overheat is definitely off, I do use sentry on park, away from home but as you mentioned I don't know if service mode disables that.

 

[That Beast Mode]

I have 16k miles on my beast, and keep track of every electron that goes into my battery. For driving efficiency I monitor wh/mile and in retiree mode I get around 400 watt hours/mile, in "Jersey Cheese cutter" mode it goes up over 600 watt hours/mile. Range wise, I monitor charge mileage vs %, so at 80% charge limit I have been getting ~240 miles, which hasn't dropped too far, down ~238 or so. At 90% for long trips charge goes to 270 miles or so, and I haven't seen any battery degradation yet.......

Ah ok, that's why I asked the question even, because based on my rough math, I would get 220mi from 100% vs you said you get 240 from 80%. I don't usually keep track of these things like you do, I just happened to notice on this trip what I left with and what I got home with and thought it was a lot of use.

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