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Does the type of gas you buy affect your gas mileage?

i have enjoyed 24-30 mpg and suddenly am getting 18 to 25...i buy gas at the murphy gas station (wal-mart) 87 octane. a mechanic told me that the gas that is being made now is terrible (with ethanol) and actually bad for the car motor...anyone seen a drop in gas mileage? could it be the gas or time for a tune up?

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Yeah ... gas for the past few years has been made with 10% ethanol, minimum.
From personal testing, it gets lower gas mileage.
Which means, contrary to what the government tells us, we have to buy MORE "foreign oil" to make more gas to go the same distance.

You may be able to find a small, independent station that sells non-ethanol gas.

Also, I have heard ... "cheap" gas sold at Walmart, Safeway, Costco, etc ... do not have the cleaning additives big stations (like Shell, Texaco, etc) have. So your engine would have more buildup and have lower gas mileage.

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I believe the higher octane gives better mileage, but you have to justify the expense

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I only benefits cars that require higher octane, it burns hotter, as far performance it's not noticeable much less cost effective to buy premium unless required by the manufacturer
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DukeCityMuscle

Higher octane actually impacts how easily the fuel ignites in the cylinder, and it has to match (more or less) what your engine was designed to burn. So changing to a higher octane gas can in fact cause problems.

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Your right, it also burns hotter and as you said, could damage the engine, causing it to running hotter than it was designed to.
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