505 CRF Fuel System Treatment, 16 fluid ounces

Great product. My big Lincoln went from a normal 22mpg to 25mpg just from having 505 CRF clean the fuel injectors in one tank of driving. Highly recommend. No, it isn't cheap, but you'll more than make the cost back in better performance and better mpg.

How I used the product: I poured entire contents of bottle into a 2012 Toyota Camry Hybrid XLE. The car had roughly 12-13 gallons of gas when I used it. I drove mostly normally, but used engine braking to increase rpm downhill or whenever possible. It took roughly 1.5 weeks for the fuel containing 505 CRF to be used. Why I purchased the product: I mainly purchased the product as a way to fix what I felt like was throttle lag. The acceleration felt weak. Fuel economy was also a consideration on the value of this product to me. My concerns: I was skeptical of this product working due to my car being hybrid. Within the past 2 years I have also changed my Hybrid battery and noticed better fuel economy with that, but performance was still lacking in my opinion. What I experienced with CRF 505: At first, I didn't notice any changes. Not for several days driving. The car still felt "squishy" as it had been. Then somewhere between 1/2 and 1/4 it starting feeling much more responsive. The acceleration is smooth, fast, and stronger than ever. The car went from being a bit of a chore to drive to becoming fun. It feels much safer to have the car be responsive to my controls. Gas economy(full transparency): I am sure many people that get product's first concern is if this will generate enough value from the save fuel economy. I don't have enough data currently to be conclusive due to several factors such as: I haven't had fuel filter cleaned, I haven't driven a full tank of since using the product, I rely on the mpg avg display which can be off several percentage(even -/+ 5% is the difference between ~4mpg in a Camry), and driving style(due to difference in acceleration driving is slightly more "aggressive". My opinion(Should you use it): I am more than happy with my purchase. The product did what I wanted it to do. The performance improvement alone is enough Value for the Money for me, and any fuel economy is just a bonus. I believe that if I had used it on 5-7 gallons of gas it would have probably helped the fuel economy more than me using it on >12 gallons. The only reason I would have to not buy the product again: It worked correctly the first time! Follow up plan: My follow up plan is to follow this up with occasional fuel treatment using Marvel's Mystery oil, and to pay attention to my mpg to see if any changes.

worksasadvertised,smootherengineperformance

First off, this is the second time I ordered this product but the first time I actually received it. Last time I never received my order and had to be refunded. Credit to the seller this time it arrived exactly as stated within two days. I tried to leave a bad review last time, but Amazon would not let me do so. Now for the product review itself. I'm sure most of us are here because of Scotty Kilmer and his praise of "Bernie's Cleaner" and so far, so good. Being it's only been one day. I did exactly what Scotty recommended after pouring the CRF fuel cleaner in my gas tank. I drove it around for about 40 minutes with the rpm's between 3500-4000 keeping it in 2nd or 3rd gear the whole time. My car is a 2007 Corolla with over 200,000 miles on it. I'm the second owner and I got the car from my aunt when she passed away, she bought it new. For years she had a problem with the cars long term fuel trim percentages being over 30 tripping the check light or "MIL" and giving a code P0171. Most of the time for this particular code it's the intake manifold gasket sucking in or allowing too much air into the system, but she already had the gasket replaced. So, I did the usual tests, 02 sensors, fuel pump pressure, exhaust manifold cracks before the 02 sensor ect... With no luck, I wanted to try the Bernie's cleaner, but I like I said I never received it, so I opted for some Royal Purple fuel injector cleaner which Scotty actually used on a Corolla in one of his videos. It actually worked for about 7 months but then the MIL light came back on. Today is August 31, 2025, I got the cleaner yesterday poured it into the car with about 1/4 tank of gas. I drove to the gas station, filled the car up with 93 octane and drove it around. Before doing so, I wrote my mileage down and checked everything with my ODB scan tool. I watched the live data as I drove around for the 40 minutes and the long term fuel trim went down from 34 to 25 by the time I got back home with the short term fuel trim reading around -1.6 and currently no code or pending code. Now that was with just one day and 40-60 minutes of total drive time. I plan on doing the same drive cycle today once the rain lets up and I will update this review as time goes by. I hope this helps others in deciding whether or not to try this product. As of right now, today, I would recommend it. But only time will tell.

Probably the best fuel system cleaner I have ever used. Thanks to Scotty Kilmer youtube review. Not cheap but it works the very best