The problem with your idea is that you aren't on the road by yourself. You could be the "world's greatest driver", but you're very likely to encounter someone less skilled than yourself. And increased speed exagerates that skill difference by decreasing the available reaction time. If you're going 115, and someone innocently changes lanes in front of you (leaving plenty of room for another vehicle doing 65), you're going to be into the back of that car before you could react.

There was a poll done once, and every single respondent said they thought they were an "above average" driver.