With an Oyster or Contactless - what's the single fare (off peak I suppose) going from a Z2 station to Z2 compare with Z1 to Z1, and I note that Z2 to Z2 could be considerable further than 1 to 1?
Gonna see if I can find out...
EDIT (TFL Single Fare Finder page)
Warren St 1 to Marble Arch 1 = £2.40
Royal Oak to Hammersmith = £2.40 o/p £2.90 peak.
Warren Street (1) to Hammersmith (2) = £2.40 o/p £2.90 peak.
Hmm, nothing in it. At £2.40 the cheapest fare between stations, unless someone uses the tube/bus for multi-trip, it's a good idea to check the distances and maybe walk!!