About £55 to fill my MX-5, not really noticed a price change lately but I barely drive anywhere at the moment, costs too much!
I don't drive at all now, although I think that has more to do with nobody thinking I'm safe driving - especially not me.
My brother drives his little Fiat Panda 1.2 to work every day, filling it is fairly reasonable at about £30-40 and it sips the juice. £35 year road tax is a bonus.