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The Tesla navigation, sorry that wasn't clear. We set the route in navigation, it told us we would arrive with a certain percentage. Halfway into the drive it became very obvious that wasn't even close to accurate.
Dude, like every 30k car these days has these things. Just because you don't NEED them doesn't mean a car pretending to be high tech shouldn't have them.
The guess-o-meter is not accurate. Last time I tried to just follow it, we would have ran out of charge at least 30 miles before the supercharger if we didn't slow down to 20 under the speed limit and turn off all HVAC (in 30 degree weather)