I might add, that many (most ?) chemistry manufacturers include in their data sheets some acknowledgement of the minimum amount of concentrate or stock solution necessary to process 80 square inches of film. This translates as the more heavily diluted the solution is the greater the volume of developer. This is of particular importance with things like Jobo machines where a minimal amount of chemistry is required and the exhaustion of the chemistry becomes a real concern.
Kodak T-Max RS recommends the following:
T-Max RS Concentrate Capacity (approx)
Concentrate per film 6.03125 ml
"Photography was not a bastard left by science on the doorstep of art, but a legitimate child of the Western pictorial tradition." —Robert Galassi