W164 ML Factory AMG 19" wheel weight and 20" replacement suggestions?
My '07 ML320CDI has the AMG package added to it and will probably have to replace the tires in the next few months. I figured it might be a good idea to upgrade to 20" wheels at the same time. However, considering the reason I bought the CDI was to have a long range between fillups, I want to be 100% sure I only upgrade to a lighter weight package with less rotating mass. TIA



