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That's too bad! My late-model BMW also has a keyless system, though an annoying gong continuously goes off when the key fob isn't detected. I think it would be hard to leave the key behind if the Model S has such a gong.
I haven't tinted mine yet, heard good things about Huper Optik. But I've also heard it can interfere with key fob. Anyone had issues with this on the Model S?