Chris, probably about 90-95% of Savannahs have "some" Bengal heritage. For some reason, it seems that Servals would prefer the Bengal girls to plain domestic shorthairs when grown up with their harem, so I hear. And a lot of the early Savannah breeders were already Bengal breeders when they discovered Savannahs so used their BG studs as outcrosses... mainly before we realized that this was detrimental to developing a type distinct from the Bengal. You can still see a strong Bengal influence in some catteries' cats.
As we progressed as a breed, we moved away from using Bengal so much...at least those breeders aiming for our breed standard did.
As we progressed as a breed, we moved away from using Bengal so much...at least those breeders aiming for our breed standard did.