Re: Premium or Regular Gas...Which r u using??
At the risk of sounding mean...You attribute a failed harmonic balancer to low octane fuel ?? Thats like blaming a flat tire on your windshield wipers 
On another note: Lower octane fuel actually has a higher energy potential per unit of fuel due to burn speed. The Octane is resistance to pre ignition by slowing the burn , lower octane fuel can have higher energy potential by faster burn which makes it more susceptible to Knock or Pre Ignition.
If you can get away with lower Octane and your engine management Doesnt reduce timing due to it sensing knock then you might actually get more performance and mileage from lower octane fuel.
Case in Point. My Motorcycle doesnt have any Knock management and it actually runs better with 87 octane.
However, I do run premium in my Crossfire.
Dont take my word for it, I'm just an engineer with crew time on one of the top sprint car teams in the country.
There are lots of cool articles about it floating around.
http://www.powerchipgroup.com/articles/PET0605.pdf
http://www.wanderings.net/notebook/M...sWorthTheMoney
http://www.mbca.org/forum/lower-octa...higher-mileage
Last edited by awilson40; Feb 3, 2011 at 06:48 AM.