I did a search on this with very little luck. I was wondering out of all of us on here who has used a gas additive. I have tried a couple of octane boosters, and could tell no difference. Anyone use one that they liked. You walk into a Autozone or Advance parts place and see a ton of these on the shelf. Most of them are name brand. I have very little knowledge of these products and would like to see if anyone has used one and maybe noticed a difference in gas mileage or something. I do use HEET products in the red bottle in the winter time just in case. Thanks in advance.
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IMO...kinda like oil additives...THEY ARE JUNK! ON a higher mileage vehicle I might run a fuel injector cleaner every 5K or so, but most gasoline requires cleaning agents etc as far as I know. And I do when they temp drops well below freezing here in Indy...use a basic fuel line antifreeze, especially if it sits for awhile. As far as Octane booster...JUNK and may make your truck run worse and do damage. Our trucks are made to run great on 87oct. But again, just my thoughts!!!

 

Agreed.

The only additives I use on occasion is Ford Fuel Injection Cleaner. I pour in a bottle 2 or 3 times a year as a preventative. Other than that, it's my opinion that additives are just snake-oil.

CMOS

 

Unlike some I have tried the majority of additives and as they said (Junk, snake oil) I have to agree as well. I also tried to do that acetone mixture with the gas to see if I could squeeze more miles out of a tank and just can't seem to get the mixture right so after about a month of testing and logging I gave up. I have a friend that is a technician at the BMW dealership here and he said that the octane boosters and fuel cleaners is a waste of money because they all use the same product (ethanol & MTBE). they warn their customers to stay away from these additives because it does more harm then good.

The following was taken from the EPA testing on these products:

“On-Road Study of the Effects of Reformulated Gasoline on Motor Vehicle Fuel Economy in Southeastern Wisconsin " U.S. Environmental Protection Agency and the Wisconsin Department of Natural Resources. The Wisconsin Department of Natural Resources and the U.S. Environmental Protection Agency conducted an on-road study of the fuel economy effects of RFG. The intent of the study was to respond to consumer concerns that RFG was responsible for large reductions in motor vehicle fuel economy much larger than the 2% to 3% reduction predicted by previous studies or by the
theoretical energy content of the fuel formulations. In this study, fuel economy was measured from a group of Milwaukee area vehicles representing various model years and fuel delivery systems, and using four types of gasolines, one conventional gasoline and three oxygenated RFGs (MTBE, ETBE, and ethanol). Eight vehicles were driven over a fixed, 100-mile route with urban, suburban and rural segments. Their fuel usage was
determined by weighing the fuel at the beginning and end of the route. The study utilized vehicles with highly variable technologies and included carbureted vehicles, port fuelinjected vehicles, and throttle body fuel-injected vehicles. The study vehicles included older and newer technology vehicles as well as a pickup truck in order to represent as large an array of on-road vehicles as possible.
In general, the results of this practical on-the-road study were consistent with the predictions (based on both laboratory and on-road studies, as well as the energy content of the fuels tested) that were set out in the RFG regulations. The average change in fuel economy when RFG was compared to conventional gasoline was a 2.8% reduction in miles per gallon when using RFG.

 

Well the last test I saw was that Techron was the only product that actualy produced some results. Fuels today contain MTBE's which produce a carbon byproduct,Techron was one product that kept the combustion deposits down.

 

About the only thing that is worthwhile in my book is Seafoam.

However, I don't add it into the tank or oil....I use it to decarbon the top end of the motor via the brake booster line.

Sure does a bang up job when used properly, and makes one heck of a mosquito fogger!