There is only a need to use premium fuel if it is a requirement for your vehicle. For example, if it says on the gas door cap or in the owners manual, 91 or premium unleaded only.
It seems there is not a definitive answer to this as far as modern vehicles go anything without a carburetor. This is not true for modern gasoline engines. A safe bet would be to check the owners manual for your vehicle or open your fuel flap to check which fuel is recommended. According to the U. Energy Information Administration, Regular grade gas is the most common choice by Wyomingites. Do you get the manufacturers recommended mpg? Many newer vehicles can adjust the spark timing to reduce knock, but engine power and fuel economy will still suffer.
It depends. For most vehicles, higher octane fuel may improve performance and gas mileage and reduce carbon dioxide CO 2 emissions by a few percent during severe duty operation, such as towing a trailer or carrying heavy loads, especially in hot weather.
However, under normal driving conditions, you may get little to no benefit. If your vehicle requires midgrade or premium fuel, absolutely. If your owner's manual says your vehicle doesn't require premium but says that your vehicle will run better on higher octane fuel, it's really up to you. The cost increase is typically higher than the fuel savings.
However, lowering CO 2 emissions and decreasing petroleum usage by even a small amount may be more important than cost to some consumers. The sale of 85 octane fuel was originally allowed in high-elevation regions—where the barometric pressure is lower —because it was cheaper and because most carbureted engines tolerated it fairly well. This is not true for modern gasoline engines. So, unless you have an older vehicle with a carbureted engine , you should use the manufacturer-recommended fuel for your vehicle, even where 85 octane fuel is available.
Ethanol has a much higher octane rating about than gasoline. Refiners usually blend ethanol with gasoline to help boost its octane rating—most gasoline in the U.
Ford Motor Company. Szybist, J. SAE Int. Fuels Lubr. Stein, R. Polovina, K. Roth, M. Whether that 85 or 86 regular octane needs a boost — and what the implications would be for the petroleum industry and consumers — will be discussed again in December by an ASTM gas and oxygenated-fuels subcommittee of various stakeholders. Subcommittee members vote on the issue.
The Colorado Legislative Council argued that theory may be valid only for vehicles predating Proponents of upping the minimum rating say engines in newer models minimize the altitude effect. Earlier this year, a proposal before ASTM to require a minimum 87 octane across the nation failed. The proposal was bucked by high-altitude states and refineries.
It failed because the majority of committee decided studies could not conclusively prove a higher octane level is needed for those states. The issue: Regular-grade gasoline in Colorado is 85 octane. In most of the rest of the country, regular is 87 octane. But until that possible change, why is Colorado stuck with 85?
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