What percentage of gasohol is ethanol?

10 percent
…to the increasing use of gasohol, which is a mixture of 90 percent unleaded gasoline and 10 percent ethanol (ethyl alcohol).

What is the octane rating of ethanol?

Ethanol has a much higher octane rating (about 109) than gasoline. Refiners usually blend ethanol with gasoline to help boost its octane rating—most gasoline in the U.S. contains up to 10% ethanol.

Does 95 octane have ethanol?

Premium unleaded is both 95 and 98. The ethanol-blended E10 (a mixture of up to 10 per cent ethanol in petrol) is a substitute for 91 in most cars 2005ish or newer. However, it pays to check your user manual. Those numbers – 91, 95 and 98 – are the so-called ‘octane rating’ of the fuel.

How much ethanol is in Costco premium gas?

According to online reports, Costco 91 unleaded gas does not have ethanol as it is a “Top Tier” gasoline. However, Costco’s Kirkland Signature brand gasoline does contain 10% ethanol in requirement with The Energy Independence.

Does diesel contain ethanol?

Diesel fuel does not need Ethanol, an additive that increases efficiency. While diesel fuel is highly efficient for use within trucks and heavy machinery, it is less effective in automobiles. The EPA has conducted studies that show diesel performs less-efficiently in cold weather conditions than regular gas.

What is the difference between ethanol and gasohol?

”Ethanol is gasohol,” said Ted Wagner, manager of product research for Amoco Oil Co. ”There`s no difference; both are lead-free gasoline with a 10 percent alcohol mix. But ethanol has no performance aspects better than gas.

Is there ethanol in 91 octane fuel?

According to Dan McTeague, a noted petroleum analyst, Shell and Esso 91 are both ethanol free. The octane rating of pure ethanol is 100, but when it’s blended with gasoline, it performs as if it’s 112. In other words, higher-octane blends — Petro Canada’s 94 and Esso’s 93 — use more ethanol, not less.

Does 93 octane have ethanol in it?

All gasoline brands have both pure and ethanol-containing gasoline under the same brand names. For example, Shell V-Power ranges from 91 to 93 octane both with and without added ethanol. It just varies from station to station, and it’s up to the station owner whether or not to sell pure gas.

Does premium fuel have ethanol?

Is Premium or Mid-Grade Fuel Worth the Extra Money? Premium gas doesn’t provide any more power or contain better additives than regular gas, and it contains the same amount of ethanol as other grades. It just resists detonation (knock) better than lower-octane gas—nothing more, nothing less.

Is there ethanol in 93 octane?

Does Costco premium gasoline have ethanol?

In response to your email, please note that our buying team has advised us that there is no ethanol in any premium gasoline sold at Costco gas stations.

Does Costco premium contain ethanol?

It is a top tier gas and their premium 91 octane has no ethanol added. Regular gas is 10% ethanol by volume. That’s it. “Regular gas is 10% ethanol by volume” for Costco.

What should be the octane of pure ethanol?

Alcohol and Octane. Best estimates of the actual octane rating of pure ethanol place it at about 100 octane. This is probably a conservative value but it is one we are comfortable with. If you see octane claims for ethanol in the 112 range, be suspicious that the octane number might be incorrectly based on BOV.

Why does alcohol have a high octane number?

This is because the law of diminishing returns applies. While a little alcohol can bump octane by a few numbers, twice as much alcohol does not result in twice as much octane increase. So while it may look like an alcohol has a high octane number when a small amount is used (as in determining a BOV), its real octane value is not as high.

Is the octane of alcohol the same as the BOV?

So while it may look like an alcohol has a high octane number when a small amount is used (as in determining a BOV), its real octane value is not as high. Problem is, the real number can’t be determined… so we’re left to guessing.

How are octane numbers determined at the pump?

Octane numbers at the pump are determined by taking the average of two ASTM-specified octane tests – the Research Octane Number test (RON, or simply “R”) and the Motor Octane Number test (MON, or simply “M”). The average is expressed as (R+M)/2 and is sometimes referred to as the Antiknock Index or AKI.