I rarely use single tickets but I have always found return tickets from Newark Northgate when travelling north for relatively short distances rediculously priced and therefore never use that route. Even Day returns and Off peak returns are totally over the top.
For example even a relatively local journry to Doncaster is £17 for a Day Return. Wakefield and Leeds are both £28.80 although for some strange reason York is lower priced at £25.50.
It isn't just Newark but the East Midlands in general that has these high prices on relatively short journeys up into Yorkshire as fares are just as bad from Nottingham even travelling via Sheffield.
From Nottingham the cheapest returns are Leeds at £28.10, Wakefield at £22.70, Doncaster at £20.80 and York at £35.50.
All of these can be reduced by splitting at Sheffield.
I am quite surprised that Northern, with their new Leeds-Nottingham service, have not found a way of offerering some cheaper Day Returns between Nottingham and Leeds to attract passengers.
If I am going from Nottingham to Leeds, Bradford, Halifax or anywhere else in that area I just get a Day Return to somewhere like Rochdale or Oldham which is only £18 and is surprisingly valid via Leeds as well as the more direct route via Manchester.
Living in central Nottinghamshire I also regularly drive to Chesterfield to make journeys to these destinations rather than use Nottingham or Newark because fares from Chesterfield to these destinations are about half the above prices.