K&NPerformance+ Octane Booster: Boosts Octane and Improves Engine Performance, 16 Ounce Bottle Treats up to 18 Gallons, 99-2020

First of all, I have to admit that the product actually seems to work.I currently use it for 4 vehicles. Since one bottle is enough for 68 liters of gasoline, I have weighed it accordingly and calculated on the tank capacity of my vehicles.I originally bought it for my Yamaha Raptor to give it something beneficial, since here in Paraguay we have gasoline with 96+ octane maximum and I have the Big 3 installed on my Raptor. After seeing some videos on the internet where octane boosters were tested in cars on a dynamometer and a power increase of 3 to 6% was MEASURABLE, I thought: I'll try that too.A direct increase in performance I have now not necessarily felt. But the engine runs very well. Good response. Definitely not worse!Next was my Yamaha WR450F. Again, I must say, it definitely does not run worse. But since the bike has endless power anyway, I don't notice any "extreme" boost in power here either.What I have to say though: It has helped to optimize the combustion. The exhaust is much less sooty!Now my last experiment:We have 2 China scooters with 125cc and carburetor technology and the two parts run far from optimal. When cold, they hardly start at all and they smoke non-stop out of the exhaust. Despite several times disassemble carburetor and clean and adjust, nothing could be improved so far - and in the beginning, the scooters ran very well, without problems.Now the miracle! Again, I added the K&N octane booster and wow: after a warm-up and then full throttle and smooth driving for a few minutes no more smoking from the exhaust, no backfiring, no knocking. So far I have ALWAYS had problems with knocking with my scooter. Especially at full throttle and the heat here because the engine is only air cooled... But since I put the booster in I have not had one jerk, stutter, knock or misfire.Both vehicles run SIGNIFICANTLY better. Cold starting works much better now too!So in conclusion I can say, especially with carburetor technology and air-cooled engines and that in warm climates, the octane booster pays off!

Nice product! Gained power and better fuel consumption! I use it in every tank now!!!

Just as expected.

Some brands are way more expensive and not an inkling better. I does make your car run better for sure. Don't expect a new engine but if you are experiencing knocking or think you might have gotten a bad tank of gas it won't hurt you to try it.

I have used this product on 4 stroke motorcycles and hybrid vehicle with 89-90 octane fuel and let me tell you I am impressed because I have not felt any strange things in the engine, no vibrations, rattling or knocking, nothing at all, just make sure to provide the necessary amount and I recommend when the tank is almost empty so that it mixes very well with the fuel and enjoy that new octane and power.

The MPG difference is significant and near instant. My truck went from 15.9 to 17.9 within one tank. Driving habits didn’t change at all. I don’t think that savings is significant, but it’s definitely doing something to make the engine more efficient and probably clean.

My car was stumbling at idle. After I repaired the issue myself with a battery replacement. As I didn’t know the age of the spark plugs/ignition coils, I decided to replace all six. The old ones were in great shape, but my mind was set already. Knowing that there had to be a lot of carbon deposits, I wanted to “blow” them out whilst minimizing more build up at the same time. I have found out that I have no performance/mileage loss from using mid-grade with my first BMW E60, but I get 93 octane as my default. I added this booster to my full tank. I drove at highway speed for an extended period of time to break in the new plugs/coils. I was getting over the estimated mpg and it didn’t drop very much on surface roads! The car was a bit more responsive overall. Even without the new parts, I believe that the slight performance would have still occurred.

This product for K and N it 100% is the best better gas mileage and smoother ride made both of my cars 2017 Acura RDX V6 and my 2008 Hyundai Elantra go quicker this thing os worth it👍!!