iPretty bad by my standards. Lost more mpg then anything, went from 25 to 19 highway, city i dont really know cuz i dont drive in the city. If your low on money its bearable but after havin them 6 months im ready for alloys. Mine weigh 22lbs each. My stock 14s with tires i know didnt weigh much over that.
If i was running smaller tires i dont think it would be real bad, but if your steppin up in tires size to anything over 30s, get alloy.