I recently did a 170 mile trip to lower Sierra Nevada mountains. On the way there, I followed a slow backroad route and made it with 70 miles to spare off a 100% charge at start. On the way back, despite my initial range of 212 miles remaining steady for the first 40 miles of descending; driving freeway speed 65 -70 mph starting draining my range so quickly that I had to take a spot behind a slow truck and cruise at 55 for the remainder of the trip. Switching from Comfort to Eco mode only affects estimated range by a handful of miles -- it really just suppresses acceleration. Same with Low Power Mode, only adds another few miles to total estimated range.
I had thought about scheduling a fast charge into the trip . . . but here's how that might have worked out:
A few days later on another trip to San Jose I stopped at an EVGO 50kw fast charger (ABB), hooked up and started charging. 10 minutes later my phone reported the sessions had ended, error communicating with car, connector locked in place. Had to use the emergency release under the frunk to disconnect. "Start/stop switch fault detected," is the error message. Tried another 50kw station, then a level 2. Neither could initiate charging. Car is at dealership awaiting return of their certified mechanic (from training). Might be software, might be hardware . . .
Love the car, but could use more range. Dealership provided nice loaner, so I am not sweating the (slow) repair. Hopefully there's a fix (and better range in the future).