EatsShoots
Member
I took the covers off two days after getting it, just for aesthetics.I have no own experience, but there are a lot of test reports (on youtube) where people compare different wheel covers of 18" wheels. The more or less same results lead me to conclude that the difference may not be the actual wheel size, but the wheel covers.
It seems that the Aero wheel covers are quite good in this respect, which is one of the reasons why I decided for the 18".
18" are better than 19" even without fuel consideration because they are cheaper, ride better, and resist flatting better (45 vs 40 profile). The obsession with low-profile tires has been the bane on my existence, living in new york where pot holes go months without attention. My last two cars had paper thin tires, and were flatting constantly, including a $1k wheel dent just a few months after getting the car.