If your car calls for regular gas and you give it premium, you're probably throwing money away. If your car calls for premium and you give it regular, your dim

If your car calls for regular gas and you give it premium, you're probably throwing money away. If your car calls for premium and you give it regular, your diminished performance & fuel economy is also most likely wasting money. Penny-wise/Pound-foolish and all. I've got a Germanic turbomotor, it's going to break if I look at it wrong. It calls for a minimum of 91 octane, but Costco in Illinois only has 87 and 93. So 93 it is.