Ahh, the wonders that a
good meal will do to your brain...
This only seems relevant when the points score is seen as a percentage of the maximum available. With that in mind, I offer Keke Rosberg in 1982.
Other possibilities would be series in which few of the quicker drivers contested all races - whether because the series were not especially popular, the rounds were geographically dispersed or not all for the same category of car.
Beyond that, such a result may be viewed as sign of no contestants being outstandingly good, or all being evenly matched and having a close-fought series. As Jenks would have said: "Who did they beat?".
All very well, but it's only half of the story. The less important half, that is.
Much more important is the scoring method, which must have a "heavy head" in order for this to work. Like F1 in the eighties, or even more extreme like the Kokomo model, which is why Gary Fisher's 13 % will be very hard to beat. On the other end of the scale are the scoring methods with a "heavy belly", like Vuky's Midget title of 1950, or more modern examples like the WoO system where you have 50 % already by only showing up for every race. Most modern championships use heavy-belly scorings, so we need to look into the past. Well, this is TNF, it's our sepcialty, isn't it?
With that knowledge, the early AAA scoring don't look so bad, with several in the 30s percentage, but none of them cracks Keke, unfortunately. This is apparently tougher than I thought. The more I now think about it, therecan't be too many better examples, to paraphrase another thread participant. Maybe one or two Italian F3 champions...?