You don't want fuel with a lower octane than is required (because you can get pinging, or pre-ignition, which can damage the engine), but you don't want fuel with a higher octane, either (because you'll be throwing away your money). When motorists see premium 91-octane gas at the pump, they may assume it contains higher energy content compared to regular 87-octane gas.

Octane stability in racing fuels is much different because fuel quality is valued more than production cost, unlike the pump gas industry where cost drives the majority of refining decisions. Higher octane fuel costs more than regular unleaded, but is it worth using 98RON if your car is recommended for 91RON, many say that you should. Fuels such as 95 or 98 RON (octane rating number) have a higher resistance to burn which indicates higher levels of energy available for the vehicle’s engine.

A minimum of 87 octane/87 AKI (91 RON); If operating at high altitude, see below. It takes more energy to make a higher-octane fuel, which means increased emissions due to production.

“Does higher octane gasoline provide for a better mileage? A lot of people seem to think higher octane gasoline will deliver better performance and economy. However, it showed a much higher decrease when the engine returned to its normal operating temperature, and as it got hotter on the dyno, showed an even greater a loss of power.

A large part of any quality race fuel is consistency. A canned fuel product can also be used. The dealer told me to use higher octane with the mix but he didn't specify. I understood him to mean anything higher than 87. Race fuels are designed to be high in octane to allow for increased compression ratios and boost levels.

The 87-octane fuel maintained more power than the 89-octane fuel. Why?” That’s a yes and no answer as it depends on engine design. That compares with gasoline at U.S.-premium levels of 92 to 94 octane. Drawbacks Could Include Higher Gas Prices After all, “high-octane” is often synonymous with increased power and performance.

An octane rating, or octane number, is a standard measure of the performance of an engine or aviation gasoline.The higher the octane number, the more compression the fuel can withstand before detonating (igniting). As stated, automakers are bleeding money in an effort to gain even a mere fraction of increased fuel economy, making that proposed 3% look mighty attractive..

However, some newer fuels are more knock-resistant than iso-octane, so for them, the octane rating scale has been extended beyond 100.

The dyno sheet for the 91-octane fuel showed horsepower and torque figures within one point of those measured on the 89-octane fuel. I don't recall exactly what the problem was, maybe carbon build up?

Australia's current standard fuel is 91 Research Octane Number (RON) unleaded and most cars sold here since 1986 were built to … This is not the first time OEMs have requested a regulation on octane levels, but it is perhaps the most vocal they’ve been. Gasoline with up to 10% ethanol (gasohol) or up to 15% MTBE (methyl tertiary butyl ether), is acceptable. In Europe, where higher-octane gasoline is common, running super-premium fuel with about 98 octane increased fuel economy 10%. The higher the fuel's octane number, the more resistant it will be to knock. First you need to understand what octane means or does, so I’ll try to explain it simplified. An octane rating of 100 indicates minimal to no knocking (iso-octane), whereas an octane rating of 0 implies that the fuel has a very high knocking tendency (heptane). That said, the compression ratio of most engines is not allowed to change significantly, so if your engine has a 10:1 compression ratio, you will NOT get better fuel economy with a higher octane fuel - the compression ratio is already set, and it is this parameter which affects efficiency.

In fact, it’s mostly a waste of money. The 91-octane gas should, they think, provide improved fuel … The higher octane of premium gas won’t make your car faster; in fact, the opposite is possible because higher-octane fuel technically has less energy than lower-octane fuel.

The main difference with premium is its octane rating — 91 or higher compared with 87 for regular octane. Higher-octane fuels allow engine manufacturers to design more powerful and fuel-efficient engines. This E15 product is not recommended or approved for use in small engines.

He said that they were having problems which they were attributing to the 10% ethanol mixes and that running higher octane helped. In many instances this is simply not the case.

Some fuel stations are now selling gasoline with up to 15% ethanol. Every engine is designed to be used with fuel of a specific octane.

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