I was friends with a guy in my youth who definitely had savant aspects. Things he was interested in mostly. For example he loved cars. Not motorcycles, not big rigs, just cars.

In a 4 hour car ride he would look out the window and give details about the cars and at the end of the ride you could ask him about car models that we’d seen between certain mile markers. He had it all catalogued in his head and could tell you what order the cars were in, their color, year, options, weight, GVWR, motor type, style, transmission type, really just about anything.