Confusing range numbers

[nj1266]

I have a 2020 Model 3 Performance. I have been running on 18 inch wheels with 255/40 tires. I have been forced to switch (damn nail in the shoulder of the tire) to the stock wheels and tires (235/35/20 with only 500 miles on them).

On the 18 inch wheels, the car averaged about 285-290 miles per charge based on my hand calculations. For example:
* Charge to 90%
* Drove 126 miles and consumed 46% battery
* Projected 134 (44% SoC) miles left on the consumption screen based on similar driving
* 29 miles for the 10% to get to 100%
* Total range 289 miles @ 100%
* TeslaFi range @ 100%=292 miles

The 285-290 mile range was very close to what TeslaFi or the Stats app gave me.

After I swapped to the stock 20 inch wheels and tires the TeslaFi/Stats range at 100% dropped to 273-271 miles. But, my hand calculated range did NOT change. I am still getting ~290 miles of range. Here is my latest example with the 20 inch stock wheels/tires
*Charge to 90%
*Drove 115 miles and consumed 41% of the battery
*Projected 146 miles (49% SoC) left on the consumption screen
*29 miles for the 10% to get to 100%
*Total range 290 miles @ 100%
* TeslaFi range 271 miles

Can anyone please explain why I am seeing such a discrepancy between what TeslFi/Stats are saying and the actual driving/projected number on the 20 inch wheels/tires?

 

[GtiMart]

TeslaFi shows two ranges, which one are you looking at? Here's mine at 48% SOC on an AWD:

The first one is using the EPA constant, the second is based on my driving so is what you'd see in the energy graph page, probably on the longest distance one...

 

[AlanSubie4Life]

I have a 2020 Model 3 Performance. I have been running on 18 inch wheels with 255/40 tires. I have been forced to switch (damn nail in the shoulder of the tire) to the stock wheels and tires (235/35/20 with only 500 miles on them).

On the 18 inch wheels, the car averaged about 285-290 miles per charge based on my hand calculations. For example:
* Charge to 90%
* Drove 126 miles and consumed 46% battery
* Projected 134 (44% SoC) miles left on the consumption screen based on similar driving
* 29 miles for the 10% to get to 100%
* Total range 289 miles @ 100%
* TeslaFi range @ 100%=292 miles

The 285-290 mile range was very close to what TeslaFi or the Stats app gave me.

After I swapped to the stock 20 inch wheels and tires the TeslaFi/Stats range at 100% dropped to 273-271 miles. But, my hand calculated range did NOT change. I am still getting ~290 miles of range. Here is my latest example with the 20 inch stock wheels/tires
*Charge to 90%
*Drove 115 miles and consumed 41% of the battery
*Projected 146 miles (49% SoC) left on the consumption screen
*29 miles for the 10% to get to 100%
*Total range 290 miles @ 100%
* TeslaFi range 271 miles

Can anyone please explain why I am seeing such a discrepancy between what TeslFi/Stats are saying and the actual driving/projected number on the 20 inch wheels/tires?

Can’t combine different quantities like this. Also cannot use projected range screen like that as it has interesting issues.

Range is dependent on conditions. It’s not fixed. The same battery capacity can go 150 miles on a particular drive in great weather, and 250 miles in identical weather on a different drive in reverse direction. It’s all the same.

Just know your capacity above 0%, and know your efficiency for a given drive (can vary a huge amount). Divide capacity by efficiency for your range.