i had the same size OZ Allegrita's with michelin MXM4's. The overall weight is 1lb less than the OZ's (OZ's with worn tires were 40.2lbs vs 39lbs RPF1 with NEW continental PCLS)
im seeing about 1-2mpg decrease for the same commute. Not sure if its the new tire, or new offset of the wheels. Went from +45 to +35. previous tires were michelin mxm4. new tires are continental pure contact LS. same size