Difference Between Gasohol 95 and Gasohol 91?


Gasohol is a mixture of gasoline and ethanol, hence the name which is a mixture of the two words. It is an alternative fuel to 100% gasoline and helps to reduce the consumption of expensive and nonrenewable gasoline.

Many countries use gasohol, such as Brazil, Canada and Thailand. Here in Thailand is has been on the market since 2001 and is being promoted to increase public use. There are even commercials on TV that speak of the good qualities of gasohol and reassures the public’s apprehensions about using gasohol. People are becoming more aware of gasohol and it’s usage has increased over the years, but many people still use regular gasoline over gasohol.

There is a very aggressive long term plan by the Thai government to change all benzene, or regular gasoline, pumps into gasohol. At this time, however, gasohol pumps are hard to find outside of Bangkok and major cities. Bangchak and PTT are more likely to carry gasohol than other gas stations, but in smaller cities it’s hard to find even one pump with gasohol. Also, Gasohol 95 is relatively more common than Gasohol 91.

95 versus 91

Gas stations may use different brand names to market the fuels, but generally they are coded in the same colors.

Regular 95 (benzene) = yellow

Regular 91 (benzene) = red

Gasohol 95 = orange

Gasohol 91 = green

Gasohol ranges from 2.5 bath  to 0.70 satang cheaper than regular gasoline at the same octane. All of the gasohol on the market in Thailand today is E10, meaning that it is a mixture of 10% ethanol and 90% gasoline. The primary difference between gasohol 95 and gasohol 91 is that the 10% ethanol is mixed with 95 octane gasoline in the case of gasohol 95 and 91 octane gasoline in the case of gasohol 91.

The mixture of gasoline and ethanol does have disadvantages such as loss of power and fuel efficiency and possibly even damage to the fuel system. The reason for this difference is that ethyl alcohol, another name for ethanol, contains about half the amount of energy when compared to regular gasoline. Gasohol 95, with its higher octane, would enable a car to perform slightly better than gasohol 91.

In order to achieve comparable performance to regular gasoline when using gasohol, engines have to be modified to use a fuel pipe that has a section area twice as large and fuel injectors that are twice as fast. Most cars that were manufactured after 1995 can handle E10 gasohol, but newer cars are being made that can function using E20 gasohol, which is 20% ethanol and 80% gasoline.

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