It's probably a lot easier to find lightweight wheels that aren't aerodynamic then put covers on them. I wouldn't upsize unless you need to, because that's going to add more weight. I'll be upsizing mine, from 14" to 15" only because it's getting harder and harder to find decent tires and I can't find them in LRR in my area unless I get 15". Not sure if you're looking for OEM wheels from another car or buying something aftermarket. If you want aftermarket, I would suggest going to tirerack (if only to look, go to the wheels section, enter in your vehicle and then select the sizes you're considering. After that you can sort the results by weight. I'm considering the
Kosei K5R or the
Enkei RPF1. They are very light and if I decide to add covers, I could easily do so.