In the United States at least there are 3 grades of unleaded gasoline at most pumps. Does it really matter what grade of gas you use? Can I use the lowest grade one week and the next week get premium if I can afford it? Does it help with milage or does it keep your engine clean? What is the difference?
In: Engineering
Follow up question. When would you ever use mid grade? Most cars use regular, some higher performance engines use premium. Is mid grade just a money maker for the oil companies from the people who think higher octane gas cleaned their engine or gets their non high performance engine better mpg?
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