Octane Boosters do work, as long as you use the right one. I recommend Dyno-Tab HP Octane Booster, it comes in a variety of packets. I purchased and used the 2-tab card Manufacturer part #45432. It is safe for catalytic converts & O2 sensors and that is very important for a daily driver or weekend warrior. Unless you have a full blow race car, no worries there. I used 2 tabs in my 17 gallon tank. 1 tab gives you 10 points & 2 tabs gives you 17 points. If you are not clear on how to read and understand the points system, don't worry it is located on the back of the product. I have to use 91 octane at every fill up, so 2 tabs bumped me up to 92.7 octane. The more you use the better. It made a huge noticeable difference. The card is also very convenient because of a less waste.