On a fresh oil change for A trip from NC to WY. Normally 16-17 mpg. I ran from Buffalo, NY to Rapid City, SD (1548mi on 82gal) for 18.8mpg on return 18.1.

This product gave great performance and fuel mpg

I just put your thankfully cheap product into my 24 year old single cam 4cyl and poof! I could instantly feel it cleaning my injectors and fuel system. Possiblycould have been just a mind effect but it seems to work well. I have to drive 30 miles to work so I will review once again tomorrow to let you know how my mpg have done. Thank you for a great product

One of the bestest product of GUMOUT! I used on my three cars, this product gave them a boost. So happy to use this product.

gave my engine a little more pep and seemed to clean the fuel system up

It does it all!! What more could you ask for from an all in one cleaner!! It cleans and lubricates key parts in your engine!! I use gumout all in one every oil change and before any extended driving trip i might make.

I was getting 33 mpg in my '14 Cruze (12k miles)...that was down from the 36 I had the first month. I put in a bottle, filled the tank, and got 38 average for the whole tank (avg 45 mph). I try to run ethanol free but only am constricted by necessity often, so only get it e-free about half the time. I did not think it could happen so quick, but this stuff fixed it even quicker!

I've been adding Gumout All-In-One after every oil change and it does seem to help me get the most fuel mileage from a 2005 Subaru Legacy wagon with over 115,000 miles.

I bought a 4 year old nissan versa the summer of 2013. My mileage was 26/31.I used Gumout all-in-one fuel cleaner and my mileage went up 3mpg in less than 2 weeks.I am not kidding. This brand works better than the Prestone brand cleaner I tried in other cars.I have been using gumout stuff for a long time but it made the biggest difference in this 1.8 versa for some reason.I put it in every oil change, full-synthetic only, and get 29/35 mileage now.

I use all in one as part of my maintenance schedule and my 4 runner runs like a boss. I've tried Lucas, STP and Seafoam and this is by far my favorite.

I have been using All in one in my three vehicles to make sure they running at peak performance. I put a bottle in before winter and also in the spring.

It does it all!! What more could you ask for from an all in one cleaner!! It cleans and lubricates key parts in your engine!! I use gumout all in one every oil change and before any extended driving trip i might make.

I have been using All in one in my three vehicles to make sure they running at peak performance. I put a bottle in before winter and also in the spring.

"I use all in one as part of my maintenance schedule and my 4 runner runs like a boss. I've tried Lucas, STP and Seafoam and this is by far my favorite."

I bought a 4 year old nissan versa the summer of 2013. My mileage was 26/31.I used Gumout all-in-one fuel cleaner and my mileage went up 3mpg in less than 2 weeks.I am not kidding. This brand works better than the Prestone brand cleaner I tried in other cars.I have been using gumout stuff for a long time but it made the biggest difference in this 1.8 versa for some reason.I put it in every oil change, full-synthetic only, and get 29/35 mileage now.

I've been adding Gumout All-In-One after every oil change and it does seem to help me get the most fuel mileage from a 2005 Subaru Legacy wagon with over 115,000 miles.

buy the all in one complete fuel system cleaner twice a month and its a fantastic product. I got a 10.5 gal tank so I can make it last two oil changes. Great value and price. This is my go to additive for myself and I occassionally throw in some in my friends cars too.