Where is the Ministry of Misinformation when you need it?

First, be careful mixing US automotive octane numbers with everything else. There are two common ways of measuring octane rating, and they result in two different numbers for the same fuel. They're called "research" octane and "motor" octane. The pumps in the US are marked with an average of the two, (R+M)/2, often referred to as "pump octane". Most of the rest of the world uses Research octane, which is 4-6 numbers higher than pump octane. So, what we call 93 octane in the US is roughly equivalent to 98 in Europe.

There is no significant difference in the BTU content of high octane gas vs. regular. In fact, in an engine that can use either, the BSFC will be lower when running regular (translation: better mileage). The reason is regular burns faster and so applies more pressure to the piston sooner.

It is the slower burning property of higher octane fuels that gives it its resistance to detonation.

If your engine management system can make adjustments based on the presence of detonation, then you can realize a performance increase with premium fuels. Otherwise, if it runs good on regular you're just wasting your money.

TMSAISTI!

 

Your stated that all gasoline has the same BTU and I challenged that. Now you say all pump gas has the same BTU. Yes maybe so.

Growing food to make fuel is costing you and me through taxes because it is not a viable form of energy.

https://rockettbrand.com/downloads/t...20Gasoline.pdf

BTU Content of Gasoline Wusz 04/24/11 Summary: High BTU content in a gasoline does not necessarily mean the engine will make the most horsepower on that particular gasoline. Many racers and car enthusiasts ask about the BTU content of racing gasolines. They always want the gasoline with the highest BTU content per gallon since the subject was addressed in an article in Circle Track Magazine some years ago. Unfortunately, this has become a situation where a little knowledge is dangerous. First, we need to ask, “ What is a BTU?”. A BTU is a British Thermal Unit. Since that doesn’t mean much to most of us, see if this will tell you a little more. A BTU is the amount of heat (energy) required to raise the temperature of one pound of water one degree Fahrenheit at or near the point of maximum density. This still may not mean much, so how does it relate to gasoline?A gallon of gasoline will usually contain from 115,000 to 125,000 BTUs. Most enthusiasts want the gasoline with the most BTUs, and that can be misleading. The BTU content is of little value if some of the gasoline is still burning when the exhaust valve opens and all of that energy escapes out the exhaust as heat and unburned hydrocarbons. Most engines that exceed 7,000 RPM can benefit more from a 115,000 BTU per gallon gasoline than a heavier gasoline that may contain 125,000 BTUs per gallon, but does not have time to completely burn in the combustion chamber. Think about this: One gasoline has 115,000 BTUs and is 95% burned before the exhaust valve opens; the other contains 125,000 BTUs but is only 85% burned before the exhaust valve opens. Simple math tells us that the first gasoline gave up 109,250 BTUs. The other gave up 106,250 BTUs. Which would you prefer? I would take the 109,250 BTUs from the 115,000 BTU per gallon gasoline. Does this actually happen? The answer is “Yes”. Although some heat energy does go out the exhaust, some goes to the cooling system, some goes to pumping losses, etc. some of it goes into making horsepower at the rear wheels. The bottom line is that the greater the percentage of the gasoline that is burned in the combustion chamber, the better off you are since those BTUs contribute to more horsepower. A slow burning fuel that is still burning when the exhaust valve opens will put a flame out the pipe that can scare the bejesus out of the guy next to you. In roundy-round racing or road course racing this may gain you a position by making the other guy stay at “flame length, but you could get better results by using a gasoline that burns faster, providing a higher level of thermal efficiency and therefore, more horsepower. It may look spectacular with three feet of flame coming out of your race car pipes that singes the paint on the car next to you, but those flames are energy being released in the exhaust rather than in your combution chamber. The same thing can happen to a good gasoline if the spark is retarded. Gives high exhaust temperatures also and contributes to overheating the engine. Think about it. Pg. 1 of 2 Š 2011 Paragon Performance Products, Mt. Prospect, IL. 60056 Some people complain about reformulated gasolines (RFG) but these products have been developed to improve combustion efficiency and catalytic converter efficiency. As amazing as it may seem, some of the same racing gasoline improvements that improve horsepower in a racing engine can also lead to reduced exhaust emission in a street engine. In both cases we want to improve combustion efficiency; in one with more horsepower, and in the other with reduced exhaust emissions. In testing conducted using a 740 horsepower 358 cubic inch racing engine with 14:1 compression ratio, the engine made 5 more horsepower on a 100 octane unleaded RFG than on 110 octane leaded racing gasoline. “How so” you ask? It is because the RFG contains an oxygenate that allows for more complete combustion and the fact that the gasolines have similar vaporization characteristics. Incidentally, Rockett Brand TM 100 Octane RFG is legal in all states including California. We have blending charts available to help you blend to a specific octane number. Check out our toll free number below

 

Unreadable cut and paste crap and wall of text.

 

Oh wow. 740 HP. OK. I surrender.

 

Apparently, you are affiliated with the minister of misinformation.

It is not the rate of burn that gives higher octane fuel its resistance to detonation, it is because the higher octane fuel auto ignites at a higher temperature.

I didn`t learn this on the internet, I learned it in Airframe and Powerplant school.

Here`s some information:

Octane, Detonation etc.

 

OP: Just use premium grade fuel.

You don`t need any octane booster or racing gas.

And avoid aviation gas for sure.

 

I hope your piglet passes out and you have to CPR it

 

.....and I hope the Albanians fill your Short Shots with dog poop.....

 

..
Gasoline has a flash point of -49°F and Hazmat Class 3,and one should rtfm

 

All this for "which gas should I use?" ... and a recommendation of ethanol so that the farmers stay afloat ?? ... I'm all for the farmers but why do I / we have to subsidize it ??