  We examine a general model for the Fisher-KPP (FKPP) equation with nonlocal
advection. The main interpretation of this model is as describing a diffusing
and logistically growing population that is also influenced by intraspecific
attraction or repulsion. For a particular choice of parameters, this
specializes to the Keller-Segel-Fisher equation for chemotaxis. Our interest is
in the effect of chemotaxis on the speed of traveling waves. We prove that
there is a threshold such that, when interactions are weaker and more localized
than this, chemotaxis, despite being non-trivial, does not influence the speed
of traveling waves; that is, the minimal speed traveling wave has speed 2 as in
the FKPP case. On the other hand, when the interaction is repulsive, the
minimal traveling wave speed can be be arbitrarily large depending on the
interaction strength and length scale.
