Why premium gas is a waste of money for most cars
The vast majority of gasoline pumps in this country offer you three choices: regular gasoline (usually labeled as 87 octane), mid-grade (89 octane), and premium (92 or 93 octane). Lots of people are uncertain about the differences between these gas types. Some imagine that occasionally treating their car to premium gas might increase performance or gas mileage — or somehow clean out the car’s engine.