  We discuss various aspects of non-local electrical transport in anisotropic
metals. For a metal with circular Fermi surface, the scattering rates entering
the local conductivity and viscosity tensors are well-defined, corresponding to
eigenfrequencies of the linearized collision operator. For anisotropic metals,
we provide generalized formulas for these scattering rates and use a
variational approximation to show how they relate to microscopic transition
probabilities. We develop a simple model of a collision operator for a metal of
arbitrary Fermi surface with finite number of quasi-conserved quantities, and
derive expressions for the wavevector-dependent conductivity $\sigma(q)$ and
the spatially-varying conductivity $\sigma(x)$ for a long, narrow channel. We
apply this to the case of different rates for momentum-conserving and
momentum-relaxing scattering, deriving closed-form expressions for $\sigma(q)$
and $\sigma(x)$ -- beyond generalizing from circular to arbitrary Fermi surface
geometry, this represents an improvement over existing methods which solve the
relevant differential equation numerically rather than in closed form. For the
specific case of a diamond Fermi surface, we show that, if transport signatures
were interpreted via a model for a circular Fermi surface, the diagnosis of the
underlying transport regime would differ based on experimental orientation and
based on whether $\sigma(q)$ or $\sigma(x)$ was considered. Finally, we discuss
the bulk conductivity. While the common lore is that ``momentum''-conserving
scattering does not affect bulk resistivity, we show that \textit{crystal
momentum}-conserving scattering -- such as normal electron-electron scattering
-- can affect the bulk resistivity for an anisotropic Fermi surface. We derive
a simple formula for this contribution.
