Will it make it?

[TaxmanHog]

That is good info- yeah I would be out of TOU by a few hours.

Couldn't you pause charging Monday/Tuesday and resume early Wednesday?

What are the start & stop times for TOU?

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[flyct]

That would mean I would use 120kw of energy for 256ish miles 2.1m/kw?
The calculator is accurate on my tesla from last weeks cold snap- but 2.1m at 20 degrees seems like quite a stretch for the Lightning?

Yes, 2.1m/kW at that temp seems like a bit of a stretch at 20dF.

Here in Florida several times a month wedo a 250 mile round trip to our remote cabin. My Tesla wall connectors, on each end, report average of 60 kWh used, (120 kWh round trip) or 2.1 m/kWh. It takes 2 hrs and 12 minutes each way. That‘s with cruise control set to 62 mph and OAT of 70dF. My average speed is slightly faster than yours.

We use 45% of battery capacity each way. It varies between 40%-50% depending on traffic, rain, wind etc. What it really interesting is that we use the same battery percentage with our Tesla model Y‘s for the same trip. Of course it takes much longer to recharge the Lightning after that trip.

 

[ccough]

Another factor in cold weather (more apparent below about 20F) that I have noticed and tried to measure is an effective decrease in available battery capacity by at least several kWh. Preconditioning helps, but on longer drives I still notice it. I am sure there is a DC fast charger along the route that would alleviate any concerns for those cold days.

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