[ptsmith24]

Originally Posted by 1.5Ldave

Before I thought there was no difference as well. However, when I first tore down my tacoma due to bad mileage after I bought it, it was all gunked up. The guy I bought it from freely admitted he bought the cheapest gas he could find. Since cleaning it up (and tearing it down again to check it out ~30k miles later) I found virtually no build up anywhere, and I have only used the brands mentioned above. So at least in my experience, the 50 cents or less extra per fill up is worth it.

This is a good read with far more technical information than I am qualified to provide.

http://vettenet.org/octane.html

Thanks