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Can I just change grades of gasoline?
Since day 1, I have been feeding my Toyota Corolla (in the year of 1999, and I bought the brand new one.) with super gasoline (93), and I didn't realize that the car only needed regular gasoline (89) to run until last week. To save money on the gasoline, can I just switch the gasoline from 93 to 89? Or is it ok to switch it to regular gasoline? If ok, what do I have to do particularly to avoid any problems? Please let me know... Thank you.