Hi Festa,
I can only comment on my car but here goes -
I get about 29mpg in and around town on average (well according to the onboard computer anyway). I spend approx £40-£50 per week but this is on normal or average consumption for me. Obviously the heavier your right foot, the more it's going to cost you.
I don't know much about the standard 18" wheels/tyres as I have the 19" rage allows but there are numerous threads on here about wheels/tires etc. - I do know that the 18" tyres are cheaper to replace etc. than the 19" ones (but I think the 19's look super sexy) - very much depends on what's driving your purchase
I still haven't had my first service yet but I would expect that it would be similar price to normal civic apart from the cost of parts - although someone would need to confirm this. There are posts on here on servicing costs etc. but I'm expecting to pay about £400. I think the warrenty's etc. are standard and not specific for Type R etc. (someone please confirm) I didn't take the 'honda happiness fixed rate repairs' and 'honda extended warranty' packages so can't comment.
I think the running costs differences between the type r and type s would be minimal and with this in mind I would have to thoroughly recommend the Typr R - you only live once, why not enjoy it fully
(Oh my god I've written an essay)