i accidentally put 93 octane in my truck the other day and i noticed a big increase in my fuel efficency. so i started running it all the time but i have had a few people say that i will do more harm than good to the motor by running this fuel. in the manuel it says to use 87. so what do you guys think.

 

I can't see how it would hurt anything. I have found that in other models once you have a lot of miles on them they run better with the higher octane. I know on my Tercel the valves don't ping under load if I run the super in it. I have also heard that some Chevy trucks get far better gas mileage with super, at least enough to offset the cost of it, or so my brother claims. I will run it in my Ford Truck too when I get some more miles on it or if gets enough mpg out of it to offset it.

 

i usually run mid grade fuel but the 93 octane is better because theres more octane and less water and whatever else they decide to put in the fuel. plus everything burns better inside the motor so theres less tuning up.

 

If you get better mileage with high test in a "regular" engine you might have carbon build up in your combustion chambers. This reduces the size of your combustion chamber, thereby increasing your compression, and leads to preignition (detonation) which in turn causes the knock sensor to retard your timing. When your timing is retarded you need more fuel to produce the power to move your truck. People who drive a lot of highway at steady speeds don't usually have these issues. But stop & go, part throttle and around town use will exacerbate this kind of build up. Try a fuel system clean up like BG, Seafoam or Techron.

 

There is not more or less water in different octanes of gas. Not trying to flame ya, just educate ya.

Gas made in Houston, get pumped via pipeline to New York. It takes three days to get there. Exxon may take out gas (New York) the same day they put it in (Houston). ALL GAS IS THE SAME! Where it is different, is in the additives and the octane that they put in it. As to cleaner gas, depends on the tank that they are stored in, and how it burns with additives. Better gas cost more.

 

A common mis-understanding - adding a higher octane fuel to a vehicle's engine will increase its performance and/or lessen its fuel consumption. This is false under most conditions. While engines perform best when using fuel with the octane rating for which they were designed and any increase in performance by using a fuel with a different octane rating is minimal or even imaginary, unless there are carbon hotspots, fuel injector clogging or other conditions that may cause a lean situation that can cause knocking that are more common in high mileage vehicles, which would cause modern cars to retard timing thus leading to a loss of both responsiveness and fuel economy.

Mine ran better on higher octane for a time. I installed new injectors, regulator, filter. It ran better and more efficiently than it ever has in the past after updating - then using the recommended octane petrol.

Eventually installed new factory O2's all around and polished the Throttle body and elbow + a portion of the upper intake. New COP's and Motorcraft plugs. My 200,000 mile + 5.4L managed 20 mpg thru Ohio on my way to PA.

Nothing I replaced was expensive. Injectors are type 3's and were new on ebay for $60 a set COP's were the same. Theres allot of crate motor take offs on ebay for sale all the time. Take offs can't be sold as new. - They have been installed or bolted once, so they have to be sold as used items. Most of the crate motors that get parted out and sold are Romeo Crown Vic 4six's engines. All parts mentioned are compatable with our truck engines. The 4.6L and 5.4L Engines.

For High mileage motors, updating in these areas can revive that old motor.

 

ok well i will clean it out i just wanted to make sure i was not gonna hurt anything cause my milege is way better i have not done the math yet but i can tell by the gas gauge.