Quote:
Originally Posted by hermtm2
Can I use regular gas instead of premium?
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I am going to buck the trend of comments here and (short) answer YES.
I think the reason some vehicles recommend premium gas is for performance reasons. Essentially in order for your car to perform at their advertised performance numbers you will have to use premium gas.
The other issue of engine reliability has to do with engine knock or detonation. In my experience engine knock is a result of carbon build up igniting the fuel too early before the timing TDC it is tuned for. Carbon build up usually gets to this point at around 100k miles at which point premium gas IS recommended IMO. However I think you can also avoid this carbon build up by using premium gas in the first place, but that is difficult for me to prove.