Very specific range question - Gen2 R1T Winter Highway (70-75 mph)

[CANCERDOC]

It's roughly 380 miles one-way. Again, I know I will need to stop. My concern is for how long. 15-20 is manageable, but 30-40 is not. If I multiply 1.9 quoted above by 140, I can get about 266 miles, meaning I'd have to add a bit under 120 usable miles at my charging stop. Here's the Gemini summary; but AI isn't the expert, actual owners are:

• The Drive (235 miles): Because you started with a perfectly warmed battery and cabin, you save roughly 4–6 kWh of "thermal overhead" right out of the gate. Rolling down I-57 South to Effingham, you will use roughly 112 kWh, allowing you to pull into the charger at a beautifully low 17% SOC.
• The Curve Maximize: 17% is the absolute goldilocks zone for the Rivian Max Pack. The truck will immediately ramp to its absolute maximum peak of 215–220 kW.
• The Short Final Leg: Effingham is only about 136 miles from your destination in St. Louis. To cover that distance and still arrive home with your strict 15% winter safety buffer, you only need to charge the truck up to 68% SOC.
• The Stop Time: Because you are pulling maximum power at the bottom of the battery pack and unplugging before the charging speed even thinks about tapering down, you are getting those 71 kWh back in exactly 15 minutes.

You won’t get an avg charge rate of 284kw in an r1 (the only way to get 71kwh in 15 min) since it maxes out at 220-230kw and that’s with a close to empty battery. Above 50% it will likely derate to about half the max rate. Not sure how you are calculating your charge curve or range but your calculations above are pretty far off. Plan on charging for longer than 15 min.

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[CANCERDOC]

How is it that rivian community not up in arms about this kind of disparity in claimed range and real world performance? especially when you pay extra $7k for it... this was one of the videos that made me uncomfortable in my decision ..... wy I asked what is real world road tripping range people get with large vs max?

To a degree all EVs have significant efficiency hits at highway speeds. The rated range is in mixed driving where you can regen a lot. Highway driving long distances is constant high speed with less regen so you will be unlikely to hit the rated range. Just plan to get 60-70% of the rated range if you are doing a highway journey and charge accordingly.