Incorrect battery or efficiency reading?

[fisheral]

I've driven my Lucid 128 miles since the last charge (100%) earlier this week. The battery shows that it has 50% left. Based on this reading I will get 256 miles out of this charge. My efficiency since last charge is 4.3 mi/kWh. That doesn't add up.

Even assuming a 70kWh battery (rather than the 92 kWh battery in my 2024 Air) to allow for a huge buffer, I should still be able to get over 300 miles at that efficiency. Using the 92kWh battery I should get over 400 miles.

One of the readings has to be wrong but I'm not sure which.

Anyone else had this problem?

 

[Buffalo Bob]

Sounds like you've used up 46kWh and driven 128 miles, so your 'since last charge' reading should be showing around 2.8 miles per kWh. Is the 4.2 miles/kWh by chance on your Trip A or B computer, with the 'since last charge' showing a far lower number? If so, you've had a whole lot of phantom drain. (I know that you clearly stated that your 4.2 was 'since last charge', but phantom drain is all I can come up with, other than a computational error, and that much phantom drain would be a real stretch!.)

 

[californiaboy935]

I've driven my Lucid 128 miles since the last charge (100%) earlier this week. The battery shows that it has 50% left. Based on this reading I will get 256 miles out of this charge. My efficiency since last charge is 4.3 mi/kWh. That doesn't add up.

Even assuming a 70kWh battery (rather than the 92 kWh battery in my 2024 Air) to allow for a huge buffer, I should still be able to get over 300 miles at that efficiency. Using the 92kWh battery I should get over 400 miles.

One of the readings has to be wrong but I'm not sure which.

You'll have overnight losses to battery thermal management, etc. It adds up, 4.31 mi(miles)/kWh takes into account only the mileage driven to kWh expended. I'd surmise "earlier this week" means last Friday, Saturday, or Sunday, since it's only Tuesday. Which could account for the discrepancy if you are in a colder climate, like your NJ profile location would tend to suggest.

 

[sri]

You'll have overnight losses to battery thermal management, etc. It adds up, 4.31 mi(miles)/kWh takes into account only the mileage driven to kWh expended. I'd surmise "earlier this week" means last Friday, Saturday, or Sunday, since it's only Tuesday. Which could account for the discrepancy if you are in a colder climate, like your NJ profile location would tend to suggest.

Since last charge will include the battery drain or any kw lost for hvac, waking up car and stuff unless something changed with recent updates.
Trip A and B only includes Kw used for driving not any Hvac during idle, overnight drain ….

 

[californiaboy935]

Since last charge will include the battery drain or any kw lost for hvac, waking up car and stuff unless something changed with recent updates.
Trip A and B only includes Kw used for driving not any Hvac during idle, overnight drain ….

Interesting, that's news to me.

 

[Halodde]

You'll have overnight losses to battery thermal management, etc. It adds up, 4.31 mi(miles)/kWh takes into account only the mileage driven to kWh expended. I'd surmise "earlier this week" means last Friday, Saturday, or Sunday, since it's only Tuesday. Which could account for the discrepancy if you are in a colder climate, like your NJ profile location would tend to suggest.

But that should be accounted for in the 'since last charge' calculation,right? My understanding is that's why the since last charge number is usually lower than the trip efficiency numbers even if you reset the trip when you unplug. The trip numbers reflect energy usage when the car is moving and exclude things like stationary phantom drain

 

[fisheral]

You'll have overnight losses to battery thermal management, etc. It adds up, 4.31 mi(miles)/kWh takes into account only the mileage driven to kWh expended. I'd surmise "earlier this week" means last Friday, Saturday, or Sunday, since it's only Tuesday. Which could account for the discrepancy if you are in a colder climate, like your NJ profile location would tend to suggest.

Yikes, it never got below 58 degrees and only briefly one night and I don't preheat (or cool) the car.