Surprisingly there isn’t a huge environmental difference between 87, 89 and 91 octane gas in their basic forms, but how each is used in different cars makes a difference. According to http://www.slate.com/id/2182076/, car manufacturers recommend a certain octane gas and you should follow that guideline, because using a lower or higher octane can be bad for your engine and the environment. If your car is built for 87 octane, using 91 octane has not been proven to give better gas mileage and can result in unused gas getting into your emission system. If you have a 91 octane recommended vehicle and use 89 octane gas, your engine will not run efficiently, which can lead to emissino leaks.
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