Have been using this for years, does a great job.

Wow what a difference in one usage... woke my 2011 5.4 truck right up... like she is new again. Did all my vehicals and i will redo all every year. Worth the cash and time.

Brand new truck. Got a tank of gas, truck started to stutter badly and would cut off. Poured this product directly into the fuel fill. Let the truck idle in the driveway and within a few short moments, the stutter was 100 gone and the foul exhaust smell from the bad gas went away. This stuff is a must if you suspect water in your gas, or bad gas from a vehicle not driving in awhile. Try this first before panicking and going to a costly mechanic. This stuff really does help with bad gas and quickly.

Very impressed with this productWorked as advertised

This fuel additive is one of the best on the market and if you are sensitive to how your engine runs, you can actually feel a difference in how much smoother it will run after using it. Recommended to used every 5K miles so this deal and quantity makes for a year's worth of use for most people at a price lower or equal to the sale price in your local auto store. It was worth it to me.

Excellent product. Been using for years. It will improve cars performance. It will eliminate any wateri n fuel system. I use once a year in a car that is not driven in winter. I highly recommend.

Quietened noisy injectors.

Did as promised!

Seems to work great

This stuff works very well I use it regularly

This stuff actually works great in 4 stroke outboards.Been using it for years now.

Works good combine it with rislone engine treatment

Not sure what warmpth and sheerness pertains to in the review, but noticed a difference within about 10 miles. My toyota sienna has 220k and was ran with no oil for a few days and 6 month old gas from the previous owner.I need to add that I had a nasty 2, 4, 6 misfire from a bad vvt solenoid. But after changing oil, changing the solenoid, and adding this... My motor went from hiccups, loss of power, extreme low-band hesitation, stuttering, and vibration, to almost like new. I can't really speak how much this product contributed to the improvement but it 100 increased fuel economy and added quite a bit of power!

I originally used this product in my 2015 Jeep Grand Cherokee, which has over 60K miles and has had a few tanks of bad 'winter' gas. It worked very well (smoother acceleration, better MPG) and was noticeable within about 10 miles of driving.When summer came along, I put it in my 2018 Camaro ZL1 as well, and the difference was EVEN BIGGER than my Jeep. The ZL1 is somewhat picky about gas, and my local station isn't terrible, but it's not the best for performance cars either. The ZL1 ran much better. Acceleration was even quicker than normal, and there was ZERO hiccups or knock-related issues.I've tried other fuel additives before, but this is the only one I've ever used that has results you will notice quickly - again, within about 10 miles of driving. And if you have a performance car, or a car with high compression or forced induction, I strongly recommend it. Works great, and you don't need to use it every fill-up. Bottle says use once every 5,000 miles, but I use it once a month.Oh, also works great as a fuel stabilizer if you store a car during the winter months. Add Hy-per Fuel to a full tank, let it run for about 20 mines (or just do a short drive), and then store it as you normally would. Easy and effective, and makes the spring start-up that much more fun.I buy 6 of these at a time so I have them on-hand. Great stuff. Recommended.

The fuel cleaner is effective for cleaning fuel systems. I initially used one bottle and had to use another bottle after a month to get the results I need.

Smooth the idle and helped throttle response. Do some new products work? Maybe but Rislone has been around for more than 90 years.

Seems to make the car run smoother. Engine sounds better.

City driving carbons up the fuel system, this is the best product that I have found to clean out your combustion chambers.

This stuff is NOTICABLE! I put it in my grand cherokee with 362,000 miles and noticed quite a difference in idle smoothness, highway passing and overall hummm of the engine. Believe me, I know this vehicle and have owned it since 26k miles / 1997 and can tell any type of difference about 'er. I will buy this stuff again.

Seemed to wake up my Avenger with 265,000 miles