1999 Infinity Q45 with 170,000 miles, started to hesitate and lag bit. The car part store employee pushed Lucas and Sea Foam, so I researched online to compare results and found B-12 Chemtool.
This products works and is less expensive, great value!

Hello. Been using your product with Marvel Mystery Oil and with full synthetic oils and also in the gas tank and went 230,000 miles on the 2000 Ford Escort and really great engine performances characteristics and gas mileage.Now using in my brand new 2014 Ford Fiesta in oil and the gas tank along with the Marvel Mystery oil and Motor Coat in oil and gas mileage going to Florida and Texas for the winter as Chicago is very cold and gas mileage us 57 miles per gallon with all my clothes and heavy 2 down blankets and 2 heavy sleeping bags and everything in trunk and the whole car all my stuff.

Absolutely the best fuel additive ever! Vehicle was having all sorts of problems lagging, choking up, dying at idle, etc. Used one can of this in 3/4 of a tank of fuel, got on the highway, drove 30 miles out and 30 miles back at 60-70 MPH and by the time we got home the engine was purring like a kitten. Thank you Berryman’s!

I have a 1999 Dodge Status with 184K miles on it. I was considering replacing all of my fuel injectors as I had at least two of them barely working and I had rough idling and poor gas mileage (~10 MPG). I witnessed the HEST test and I decided to try the B-12 Chemtool ($4.99 at my local parts store). I put a can of it in my empty tank and then filled to a 1/2 tank with premium. Holy Cow!!! My injectors are all firing 🙂 Yay!

this is a revised update by me on the continued use of using b12 chemtool in my gas tank. at every fill i use 4ozs in the 11.75 gal tank. i’ve noticed the following mileage increase – almost 4 miles, no hesitation & quicker start up. my kia rio 2008 runs as good as the day i bought it new. by the way i just turned 307,000 highway miles on it. i’m truly grateful for this wonderful product of yours.