I changed my stock 15" rims and tires 2 weeks ago to a 16" rim and Michelin Primacy LC tires. The Primacy LC size is R16 55 215. Each rim with the Primacy LC tire weight a few kg more than the stock tires and is 2cm wider. The handling is very much improve with less rolling when turning and it's very quiet too.
Due to the heavier weight of the new wheels, I expect higher fc but the results from my first full tank seems rather surprising. Looks like the fuel efficiency claim of the Primacy LC is indeed true and more than offset the heavier weight and wider tires.