Will R18 rims/tires fit?

they would fit fine but why 215 tyres? are you lowered??

i thought youd only need 215s if you had a lower et, like in the 40s
 
T8DPR: no, my car is not lowered. I dont want to use wider tires because of fuel economy and agility (I think 1.2TFSI is little weak for wider tires).
 
225 40 18 tyres is what you need coz thats what audi will fit for you if your car was an s-line which also comes with 18 inch rims.
 
i could be wrong, but on an 18" rim, the difference in economy from a 215 to a 225 tyre width would be very very little?
 
it doesnt have to be a set tyre width, 225 is perfectly suitable for 7.5"-9" width rims