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
Use the gasoline recommended by the manufacturer. If you do not have a special high-performance car you would use the lowest grade.
There is no advantage to use a higher grade. You need to design the engine to have higher compression for it to be useful and then lower grad will work badly in the engine. The octane rating of the fuel is about how much you can compress it before is spontaneously detonate. So use the lowest grade the manufacturer recommend because it leaves more money in your pocket.
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