It's a new record

[DreadPirateRoberts]

Originally Posted by Andrew

If I don't use premium, the engine monitor will retard spark timing since it can't burn the fuel as efficiently, thus reducing horsepower and mileage. It also leads to dirty injectors. [not a car guy] Or something like that. [/not a car guy]

I would have to respectfully disagree that premium would lead to cleaner fuel injectors, I think that depends more on the additives they put in rather than the premium/regular choice, so that could be brand dependent.

I didn't realize reducing the horsepower might reduce the mileage. I googled around and found an interesting article:

"High-test does have a potential fuel economy benefit. It is slightly denser than lower-octane gas, meaning there's a little more energy in a gallon. But the small difference is hard to measure in real-world use, and that same density can contribute to undesirable buildup of waste products inside the engine. "

I learn something new everyday