Mulholland is not a particularly great road from Topanga to just past the Rock Store, then it tightens up into a section called the Snake that has some particularly tight turns as it goes uphill (or down). However most of the crashes take place in the more medium speed sections. I don't really know why, too many squids there that don't know, obviously, what they are doing, I guess. Continuing west past Kanaan-Dume to PCH Mulholland a decent road but a long way from being the best around. There are a lot of other roads that branch off Mulholland that are far more fun. Latigo Canyon is probably the closest to Deal's Gap, except it's uphill (or downhill, depending on which way you're going) with more variable turn radii than Deal's Gap seems to have. It's about the same length. I haven't counted the turns, But there are certainly plenty of them.
With all the other great roads by Malibu, you really would have a long day ahead if you were doing to try to hit all of them.
Of course, we don't have to put up with semis on most of these roads...
Bare