Customer Ratings & Reviews

This is the only fuel treatment I've used that gives immediate benefits. When my wife's RAV4 was hesitating / lurching, one bottle cured it. (Probably fuel buildup on throttle body?)

Need more miles to evaluate product properly.

Good stuff....use it in all our cars

I use P.I. In every machine I own, this product actually cleans the carbon off the valves. I use my borescope to look at the valves when I change my spark plugs. Even the top of the piston is cleaner every time I check them.

I Use every 4000 miles to maintain optimal fuel mileage and engine performance in all my vehicles.

I have used this on my 2003 Liberty with the 3.7 and it has worked wonderfully, I do a lot of highway driving as well as a decent amount of city driving and have seen as much as a 2MPG increase since I first put this fuel system cleaner in. Definitely does what it advertises to do.

Had issues with a gator running rough, this took care of the issue

I run the Performance Improver through my gas engines at least a couple of times a year. It is another Amsoil product that I trust to keep my vehicles running great.

Did like instrucion said but made car run rogh at idle.

This stuff is amazing. Keeps our cars injectors clean and have seen close to almost 2mpg better mileage after using it

Not sure why I even Buy this Stuff 🤷‍♂️ but I do Occasionally to Put in our 2018 FORD EDGE V6. I do not get any More MPG at all, NOT 1" further, I use it Hoping it Cleans stuff up. At the Price of this, I use StarBrite On a Regular Basis, 32oz ($30) Treats 1200 GALLONS. and, It works for a Multitude of Uses/Issues including Diesel Issues.

that is right. MPG increase from 27 to 30, more quiet. I like this staff.

Use only once so far. I have 202,000 miles on truck. It has improved my gas mileage by 3 miles per gallon. I’m sold this stuff is awesome.

I love all of Amsoil products!!!! Could not be more happy!

Used this in my 95 civic w/ 189k. Bought the car at 186k. Went through two fuel tanks to get an average Mpg. This vehicle was very low on power and could barely moved with the ac on. Performed a tune up test drove for 1 full fuel tank to see a difference in mpg. Then on the 4th fuel tank added this product. After I ran through the whole tank. Checked mpg on every tank after and verified mpg went up a consistent 3 mpg. Throttle response definitely improved and idle (if anyone knows these older Hondas, they are very sensitive to idle speed/quality)

Highly recommend for added performance, and additional gas mpg was very satisfied with this product and continue to use. Currently use in GMC Yukon over every few tanks of fuel, especially on long trips pulling boat & trailer.

I use the PI in my Jeep Wrangler's fuel once every 4000 miles. At 50K miles I'm still getting about 16-17 MPG in town and 21-23 MPG on the highway. Who can argue with success

Improved gasmilage

AMSOIL provides great product value and customer service.

Well worth investment helped with due mileage even at only 20,000 miles. Helps with carbon monoxide excess with newer motors running variable cylinder management.