B8 R Line Rims for B7 ?

Hi there.
Yesterday I bought 4 R line rims 19 inches for very good deal.
No visible bents/cracks. Some curb rash for being formal rental car. The owner swapped to audi rims so these were for sale.
I currently have 18's on my car but the deal was so crazy,could not resist!
Now I checked tire websites and they (235/40/19) tires run for at least 150$.
I am also curious about the mpg.
Did anyone try it before? running 19 inches on 235/40/19.
Which tire did you guys use and what is the impact on mpg?
Thanks!

width and weight will affect mpgs, i'd say minimal if you're doing longer highway.

I wouldn't be shocked for 1-2mpg hit for looking cool on fat 19" rollers.