I do not see the horn as an upgrade. I think the current horn is deficient and needs to be recalled/ replaced by Rivian. I sent Rivian an email and got, will pass it on reply. SAFT ITEMS need to jump to the front of the line.
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I went from a MB G500 10 mile/gal to R1S. An 850-mile trip with the G500, 22 gal tank was 4 fuel stops 12.5 hours. The R1S 17 hours. Not sure electric is for long trips.