Not sure what the breakpoint is to achieve a savant level of ability, but if it was anything it'd be my spatial cognition, which can be expressed in a lot of ways that is unintuitive to most people's understand of the concept.
One odd way it seems to be expressed is my cognition of metaphysics with spatial concepts, like shapes, volume, quantity, positioning etc. It allows me to naturally handle symbols and their interactions better than most. My grasp of semantics (and naturally, my propensity for pedantics) seems to be better all around than most. The most obvious behavior regarding this would be the number of words I know, can figure out, and that pop into my spoken/written vocabulary.
Another odd expression of this is my handling of possibilities. I tend to consider a broader array of possibilities than most. I tend to form my understandings based on spatial concepts, so when considering possibilities I imagine/mentally simulate a kind of spatial environment based on info known of the situation at hand and just kind of throw any related or interacteable ideas at it to see how they interact. And funny enough, this also boosts my potential for creativity. Once I became aware of and familiar enough with the ways creativity works it was just a matter of replicating known efficient methods.
One of the traits I remember exhibiting quite strongly during childhood was in accounting, in the areas of finance, social interactions and property.
The most obvious behavior in my childhood was my ease at understanding maps (even if my memory for names was far below average, a necessity for geography class), with 3D crafts like origami and lego, and the various spatial perspectives and transitions present in video games.
As I grew up I realized I had a talent for learning and tinkering with things, and I did very well with mechanics, math and engineering. I was the best in my class at handling kinematics and 2D and 3D modeling. Conversely, I was the worst at picking up calculus. Rather than learning it as an operation with rules, I had to seek out the more geometric origins of it before it finally clicked.
That being said, my memory regarding spatial cognition is only a little above average, so in that regard I'm definitely not at savant levels... but I'm fine with that. Memory extinctioning is important for evolving new and more complex ideas, not to mention fueling the desire for novelty and new information, a necessity for better understand the world around us. I do remember places I've traveled very very well, though.
Fineprint: I'm basing my 'ranking' by contrasting my self awareness against the observable behavior of others, which of course has it's limits. As such, I have no idea where exactly my 'ranking' lays aside from being secure in the knowledge that it is above average. As far as guesses go, within the bracket of above average I'm very likely not in the bottom quarter, and very unlikely to be top quarter (though still possible). Not sure elsewise.
_________________
Thank you deeply for sharing your experiences. I don't feel so alone anymore.