If you employ .by the book. type of vehicle maintenance, which means you strictly follow the manufacturer's recommendations, and you didn't notice any sign that you need fuel additives, you probably didn't need one. Your vehicle is actually designed to work without them in all its systems, not unless the time comes when the only way to ensure smooth vehicle operations is to use a fuel additive. If that's the case, you need to make sure you'll use the right type and amount of additive as well as the frequency of using such.
Since this will be used along with the fuel and will get in contact with some of the vehicle's major components, you need to think twice before shopping and do your research, or you may end up ruining your engine and sabotaging your vehicle's performance. Here are some things you should do before getting fuel additive:
Seek expert advice.
When thinking of adding any foreign component to your vehicle, most especially to your gas tank, it is always wise to ask for pieces of advice from the experts. Don't rely on a person who doesn't have much automotive knowledge. You also shouldn't trust people who are selling fuel additive because they will just make you feel like you don't have a choice but to use additives just to convert you into sales and, therefore, profit.
If you don't know anybody who can help you, you can go online and read some write ups about these .supplements.. You can try to email the author to ask for advice. While some may ask for a fee for any kind of know-how they can impart you with, there are still lots of people who will be willing to give you useful information and advice. Just try to ask them for information.
Find out if you really need fuel additives.
If your vehicle is still in good shape and is performing well, you actually won't get any benefit from using a fuel additive. But if you own an older vehicle model and you need a boost in your octane rating, or your diesel fuel has lots of impurities, then you have a reason to use an additive.
Again, don't pour any foreign element in your gas tank unless you're sure that you need it. You should also consider if there's really a need to boost your vehicle's octane rating for cleaner burning of fuel and better performance. Yes, additives can improve the octane rating of a vehicle, but they're not a substitute for high-octane fuel.
Also, you need to be sure of the kind of fuel additive to use. Is it really an octane booster? Or perhaps, you need a cetane booster because your engine has lower than 40 cetane rating? If you're going to use a cetane booster, you have to strictly follow the expert's recommendations or the label on the product's bottle to obtain the best results.
Fuel system cleaners, on the other hand, can be used if you aren't sure about the purity and cleanliness of products in the fuel station where you regularly have your tank refilled. However, running a cleaner in your fuel system should be done only once in every 8 to 10 fill ups.