Typically, farther is defined as distance and further is degree. Yet Ford commercials use "Go Further"* and a dance company uses "Fall Further. I think both, and especially Ford, mean distance.

*Accompanied by the song, "Go further."

In an attention-getting direct mail piece, Kimberley-Clark, manufacturer of Cottonelle toilet tissue, used the head and sub-head: 
Try the routine that gets your bum clean 
The Cottonelle Care routine