4 ms·

It's impressive how well these estimates work, given the outsized impact many of these factors can have. These things are more negligible in an ICE as the denom

by z2 3y ago

It's impressive how well these estimates work, given the outsized impact many of these factors can have. These things are more negligible in an ICE as the denominator of energy stored in a gasoline tank is 4-5 times more than an EV. I believe a typical EV has to make do with the equivalent of just 2-3 gallons of gasoline in energy on a full battery charge.

_jal 3y ago
Do we know it doesn't cheat? We know the range estimates used to (?) be gamed[1], I don't see why this part wouldn't be, too. [1] https://www.reuters.com/investigates/special-report/tesla-batteries-range/ https://www.reuters.com/investigates/special-report/tesla-ba...
- stetrain 3y ago
  If I say I want to go to X destination the car says I will arrive with Y battery percent left. This is accurate to me within about 5% of the battery, even driving at fast highways speeds and in cold weather. If it was "cheating" I think I'd notice an issue when the car said I had 5% left but the real battery charge was empty.
- xedeon 3y ago
  Claim: "The nav calculated estimations tend to be very accurate" > Do we know it doesn't cheat? Then the nav won't be accurate then would it? Also: https://www.linkedin.com/in/gregory-pannone-3a414610/ https://www.linkedin.com/in/gregory-pannone-3a414610/
- thebruce87m 3y ago
  It would hurt the brand to cheat the sat-nav based range, it would mean the car wouldn’t make it to a charger when it said it would. You’d have a lot of unhappy customers. Think of the sat-nav range as closed-loop and the other testing based ranges as open-loop.
gizmo686 3y ago
The energy density of the fuel isn't an apples-to-apples comparison. The chemical energy stored in gas is much harder to use. ICE cars typically get around 20-40% efficiency. Electric motors typically get 80-90%. In some sense, they do that by moving the losses to before the battery/tank; so this isn't as big of a gain in terms of total energy usage. However, in terms of the effective capacity of the energy storage device, we don't really care about losses in refilling it.
Denvercoder9 3y ago
> I believe a typical EV has to make do with the equivalent of just 2-3 gallons of gasoline in energy on a full battery charge. The 57.5 kWh battery in the base Model 3 has the same energy content as just ~1.18 US gallons (4.46 liters) of pure gasoline. Electric motors are a lot more efficient than combustion engines, though.

by z2 3y ago

_jal 3y ago

Do we know it doesn't cheat? We know the range estimates used to (?) be gamed[1], I don't see why this part wouldn't be, too. [1] https://www.reuters.com/investigates/special-report/tesla-batteries-range/ https://www.reuters.com/investigates/special-report/tesla-ba...

stetrain 3y ago
If I say I want to go to X destination the car says I will arrive with Y battery percent left. This is accurate to me within about 5% of the battery, even driving at fast highways speeds and in cold weather. If it was "cheating" I think I'd notice an issue when the car said I had 5% left but the real battery charge was empty.
xedeon 3y ago
Claim: "The nav calculated estimations tend to be very accurate" > Do we know it doesn't cheat? Then the nav won't be accurate then would it? Also: https://www.linkedin.com/in/gregory-pannone-3a414610/ https://www.linkedin.com/in/gregory-pannone-3a414610/
thebruce87m 3y ago
It would hurt the brand to cheat the sat-nav based range, it would mean the car wouldn’t make it to a charger when it said it would. You’d have a lot of unhappy customers. Think of the sat-nav range as closed-loop and the other testing based ranges as open-loop.

gizmo686 3y ago

The energy density of the fuel isn't an apples-to-apples comparison. The chemical energy stored in gas is much harder to use. ICE cars typically get around 20-40% efficiency. Electric motors typically get 80-90%. In some sense, they do that by moving the losses to before the battery/tank; so this isn't as big of a gain in terms of total energy usage. However, in terms of the effective capacity of the energy storage device, we don't really care about losses in refilling it.

Denvercoder9 3y ago

> I believe a typical EV has to make do with the equivalent of just 2-3 gallons of gasoline in energy on a full battery charge. The 57.5 kWh battery in the base Model 3 has the same energy content as just ~1.18 US gallons (4.46 liters) of pure gasoline. Electric motors are a lot more efficient than combustion engines, though.