type of gas?

[callmelenny]

Stolen from Wikipedia:

The most important characteristic of petrol is its Research Octane Number (RON) or octane rating, which is a measure of how resistant petrol is to premature detonation (knocking). It is measured relative to a mixture of isooctane (2,2,4-trimethylpentane) and n-heptane. So an 87-octane petrol has the same knock resistance as a mixture of 87% isooctane and 13% n-heptane.
There is another type of Octane, called "Motor Octane Number" (MON), which is a better measure of how the fuel behaves when under load. Its definition is also based on the mixture of isooctane and n-heptane that has the same performance. Depending on the composition of the fuel, the MON of a modern petrol will be about 10 points lower than the RON. Normally fuel specifications require both a minimum RON and a minimum MON.
In most countries (including all of Europe and Australia) the 'headline' octane that would be shown on the pump is the RON: but in the United States and some other countries the headline number is in fact the average of the RON and the MON, sometimes called the "Road Octane Number" or RON. Because of the 10 point difference noted above this means that the octane in the United States will be about 5 points lower than the same fuel elsewhere: 87 octane fuel in the United States would be 92 in Europe.
It is possible for a fuel to have a RON greater than 100. This reflects the fact that isooctane is not the most knock-resistant substance available. Racing fuels, Avgas and LPG typically have octane ratings of 110 or significantly higher.
It might seem odd that fuels with higher octane ratings burn less easily, yet are popularly thought of as more powerful. Using a fuel with a higher octane allows an engine to be run at a higher compression ratio without having problems with knock. Compression is directly related to power, so engines that require higher octane usually deliver more power. Some high-performance engines are designed to operate with a compression ratio associated with high octane numbers, and thus demand high-octane petrol. It should be noted that the power output of an engine also depends on the energy content of its fuel, which bears no simple relationship to the octane rating. Some people believe that adding a higher octane fuel to their engine will increase its performance or lessen its fuel consumption. This is false - engines perform best when using fuel with the octane rating they were designed for.
The octane rating was developed by the chemist Russell Marker. The selection of n-heptane as the zero point of the scale was due to the availability of very high purity n-heptane, unmixed with other isomers of heptane or octane, distilled from the resin of Jeffrey Pine. Other sources of heptane produced from crude oil contain a mixture of different isomers with greatly differing ratings, which would not give a precise zero point.

[duma]

i have no freaking clue what u just said...lol

[callmelenny]

i have no freaking clue what u just said...lol

:lol:

1. Octane is a funny chemically thing and different countries report it differently. My GS says I need 91 but that corresponds to around 86 in American measurements.

2. Higher octane is necessary for higher compression engines and some of these higher octane fuels have funny names.

3. People incorrectly assume that since higher power engines use higher octane fuel, that the funny fuel is the source of the power.   This myth is reinforced by the gas companies to increase their profits.

The main lesson, stated by others, is:

"If the bike ain't knocking, then put the money (for extra octane) in your stocking."  

[GT Eye]

Can someone tell me how much time I have until the gasoline 'spoils' without stabilizers?

[scratch]

Could be a week, could be a month; depends on conditions (weather). I prefer to err on the side of caution, to prevent headache later.