metric marketing mixup

As I am sure alot of people know, America's conversion to metric has taken a back seat in terms of priority since the mid 1990s.  In the early 90s, the Fair Packaging and Labelling Act was amended to make metric labels a requirement alongside inch/pound units, however, using metric only was (and still is) prohibited by the FPLA.  The continuation of inch/pound labelling has negativelly affected package marketing.  For example, a 500 mL bottle of  soda is often marketed as 16.9 FL OZ in either larger labels, or on a box/shelf.  Interestingly enough, 500 mL bottles of water are usually marketed as 500 mL or .5 liters.  However, store shelves display it in customary units.  What I think should happen is for stores to all come to a consensus with product manufacturers to market products that are of rounded metric sizes, to their metric size, instead of ounces.  This may help prevent people from thinking "16.9 oz" when seeing a 500 mL bottle.  However, bottles is just one example.  When I was at target, I examined a 750 mL container of cleaning liquid, marked as 750 in the primary label spot.  However the store markets it in fluid ounces.  Dissapointing, but it provides an opportunity to contact the stores and explain how marketing in metric helps the consumer associate with SI units.