We have had this challenge out there for years. Most start it, but then drop out after a week or s either due to the amount of effort to document all, or more commonly they see the drastic difference and as most challenges are from either loyal customers of the brand they intended to test against the RX (or were a rep of the can company) and did not want the results posted in public. We have taken this challenge for years, and although results vary from 5-10% for the cheap ebay type to some approaching 80% plus (only 3 others on the market get near that). But 95% fall into the 15-20% max effectiveness no matter how well known the name (and there are 30-35 cans all made by the same companies, same design, same size.
Remember, any can is better than no can, but when you get into the new direct injection engines of today, you need to stop all the ingestion to prevent the intake valve coking issues that plague all DI engines no matter what the brand.