Cybertruck failed elementary arithmetic.

[CyberTruckeeTheOne]

I was charging in Truckee. Cybertruck gave notification I now have enough charge to make it to my destination near the Bay Area.

Numbers on screen batter range at 141 miles.

Same screen, navigation says I have 155 miles to go to my destination.

And Elon wants us to trust our lives on it's algo (high math) on FSD?

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[SteelMyHeart]

It may taking into account going downhill from truckee to bay area. What did energy usage turn out to be and how did it compare to that estimate?

 

[UberNoob]

Surly the AI math is correct, weather man forecasted a significant tail wind. ?

 

[SteelMyHeart]

The truck made a hypothesis and the experiment took place right after. So what is the result? Was the truck wrong by 14 miles? More? Less? I could easily see what is essentially a 6 to 7% battery conservation due to downhill coasting from truckee to bay area.

 

[mongo]

I was charging in Truckee. Cybertruck gave notification I now have enough charge to make it to my destination near the Bay Area.

Numbers on screen batter range at 141 miles.

Same screen, navigation says I have 155 miles to go to my destination.

And Elon wants us to trust our lives on it's algo (high math) on FSD?

Every 1,000 pounds that moves 1,000 feet in altitude gains you 375Wh or approximately 1 mile of range.
Cybertruck + passengers is 7k pounds, so you gain 7 miles of range for each 1,000 feet of descent.
Truckee is at over 5,000 ft vs the Bay as sea level. That means 35 miles of added range.
141+35 = 176 - 155 = 21 mile buffer or ~6%.

 

[CyberTruckeeTheOne]

It may taking into account going downhill from truckee to bay area. What did energy usage turn out to be and how did it compare to that estimate?

I wish!

Turned out 473 Wh/mi.

I would be f'd had I followed it's advise.

Happened to me also in Supercharger scarce Montana to Calgary road trip.

CT told me I have sufficient charge at 80% to make it to next Supercharger. I charge to 100% having developed serious range anxiety in Idaho where energy usage at some trips makes me look like I'm pulling an RV (did not for Supercharger distance reason).

Even at 100%, I ended up with just 17% on the tank.

And you don't want to be stranded in those remote stretch of highways in the middle of nowhere with no cell signals and Tesla Service is way way way out with official travel advisory telling you to bring blankets, extra water, food and an ax (in case of Big Foot attack?)

 

[XCeilidhX]

Another thing to watch is speed. My understanding is that rated miles usually are based on government mandated speeds for testing and range certifications which are often like 50-55 mph if I remember correctly. Each MPH faster than that reduces the range from that predicted as a result.

For the longest time I have wanted an actual personal average useage range display. Like after 1k miles of driving the vehicle would use your personal average Wh/mi since taking ownership to calculate your predicted range given state of charge instead of generic rated mi of range because each person’s habits are different.

But since that isn’t the case, you are correct that in the real world it can overestimate range capacity given SOC so have a fudge factor ready and leave some room to stay safe. The range anxiety will go away once you get used to it except in extreme charging desert cases. My advice for that is have an app that lists RV campsites like KOAs and such just in case you need to have a higher amp plug for an hour between superchargers when they are few and far between on your route.

My 2 cents FWIW.

Cheers

 

[CyberTruckeeTheOne]

Yeah, I would agree. Downhill from Truckee would have me regen.

And my not-so-ideal results was maybe because I have to punch it to overtake those rows and rows of semis, at times, like inter-connected freight trains.

 

[CyberTruckeeTheOne]

@XCeilidhX - off topic, does KOA campsite now mandate to allow EVs to charge in their campsites?

I heard that there are still full hook up campsites that don't allow it with the misconception that it will overload their circuitry.

I would again venture into long camping trips with the assurance.

It is abosulotely necessary for overnight charging in non supercharger or destination charging. Some hotels allow it for their customers only although Holiday Inn (and IHG member hotels) plan to put it in all of their hotels. But they not there and I've seen only one: in Idaho Falls.

 

[GFleck]

As others have mentioned... the missing key data is how you drive, speed, acceleration, etc. The difference in range we get when my wife is driving vs me is significant! ? (she gets way more)

 

[CyberTruckeeTheOne]

As others have mentioned... the missing key data is how you drive, speed, acceleration, etc. The difference in range we get when my wife is driving vs me is significant! ? (she gets way more)

Am an angel on wheels on my CT until a
Ram cuts me off or a Corvette goes broom, broom, broom beside me.

My Cybetruck's pride easily gets poked.

 

[Crissa]

Truckee is a mile up in the sky and you arrived with 17%.

Sounds like you were both speeding and had more than enough power left.

Punch it, Chewy is definitely going to chew through battery.

-Crissa

 

[tmeyer3]

@XCeilidhX - off topic, does KOA campsite now mandate to allow EVs to charge in their campsites?

I heard that there are still full hook up campsites that don't allow it with the misconception that it will overload their circuitry.

I would again venture into long camping trips with the assurance.

It is abosulotely necessary for overnight charging in non supercharger or destination charging. Some hotels allow it for their customers only although Holiday Inn (and IHG member hotels) plan to put it in all of their hotels. But they not there and I've seen only one: in Idaho Falls.

I've had a 100% success rate with maybe a dozen sites so far, most with partial hookups, by paying for an RV hookup site. No one has seemed to mind here in California, yet.

 

[Woodrick]

The number of miles on the front screen is bogus, which is why many recommend turning it to percentage.
Want a more accurate answer? Look at the Energy Graphs.

The numbers ONLY match when you drive the EPA profile tests.

 

[Woodrick]

@XCeilidhX - off topic, does KOA campsite now mandate to allow EVs to charge in their campsites?

I heard that there are still full hook up campsites that don't allow it with the misconception that it will overload their circuitry.

I would again venture into long camping trips with the assurance.

It is abosulotely necessary for overnight charging in non supercharger or destination charging. Some hotels allow it for their customers only although Holiday Inn (and IHG member hotels) plan to put it in all of their hotels. But they not there and I've seen only one: in Idaho Falls.

Camping at KOA campgrounds with an electric vehicle (EV)

I don't know why you make a blanket statement "misconception that it will overload their circuitry" because there have been examples that it does. Many pedestals are not built for 100A service (all plugs at max at once). I suspect that many have maybe only 60A breakers.

NEC allows for oversubscription like this. Want an example, go plug a space heater into every plug in your bedroom and turn them on. You probably won't get past two heaters before the breaker trips.

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