I've always thought of it as more of a logarithmic scale. If I'm driving my lap and I'm absolutely on the edge, nailing every entry and exiting within (or over) a few millimeters of the track out, then I'd consider that 10/10ths. For argument's sake, we'll say that was a 100 second lap. The next step wouldn't be a 90 second lap, rather a tenth or so off of that at 100.1-100.2. Then at 8/10ths, about a second off of that. Then, at 7/10ths, maybe 10 seconds. Beyond that it seems to flatten out in my mind...maybe an inverse log at that point.
That's how it sits in my brain. As you see, opinions vary.
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