If the Bulldog parent is an English Bulldog, how does this tend to influence the potential mixed-breed lifespan range?

Answer

Heavily weight the lower end of the mixed lifespan

When the parent breed is the English Bulldog, whose purebred average is lower, its genetic contribution tends to heavily weight the lower end of the resulting mixed breed's potential lifespan.

If the Bulldog parent is an English Bulldog, how does this tend to influence the potential mixed-breed lifespan range?
DogbulldogmixExpectancy