It's pretty obvious that any subsidy would be aimed at higher priced tickets and with a view to selling out our allocation. Southampton allocation is low - 2500 - and the price of the ticket isn't too steep. Not sure City will factor in petrol, coach, time off work and trains (i.e. the overall package) when deciding on which to subsidise.
Arsenal and Spurs are obvious candidates, being about £55 a pop, less so Fulham (£51?) although we do get a full allocation that may be hard to shift given it's closeness to Christmas.