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Originally Posted by dtownfb
Rolm: I have no doubts that your engine did feel stronger. This winter i had a few misfires which I attribute to the gas line antifreeze I added (HEET, I believe). I added a couple of bottles of Chevron Techron to clear up the lines (it was suggested by someone in another forum). I swear my engine felt stronger and it did help clean up the fuel. But I did not experience better gas mileage (I keep a notebook in my car to track mpg). If your Intrigue runs fine on 87 octane, then using 93 is a waste of money. If it makes you feel better, use 93 for every fifth fill up.
Now having said that, I don't buy the "top tier" vs. "cheap gas" argument. I live in southcentral PA (not to be confused with southcentral LA). This area is dominated by Sheetz, Rutter's, Turkey Hill. You would be hard pressed to find Exxon, Mobil, Sunoco, Shell, etc. (Haven't seen a Chevron station in about a decade). In our area, there is one distributor for all the gas.
I need hard proof that a) the additional additives that Shell, Amoco, Chevron add to their fuel are necessary and b) this "cheap gas" is bad for fuel lines and engine. BTW, a definition of "cheap gas" would be nice. My 2000 Intrigue has 144k miles and the last 5 tanks have averaged 27.5 mpg. I have never cleaned the fuel injectors and the current fuel filter has been on for about 80k miles. I did some searching on the internet and haven't been able to find these answers. I found tons of articles on Top Tier gas but nothing that says it is necessary for the average car? If I had a BMW or Mercedes then yes I would fill up with 93 octane at Exxon all the time. Instead I have a 8 year old car with 144k miles on it. I'll fill with the cheapest gas I can find and save my money for other things.
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It sounds to me that the local brands you mentioned do a good of putting additives into their gasoline. Otherwise, I doubt that your Intrigue would be running as well as it is. You are also using after-market additives. Around Oklahoma area QT is a good brand of gasoline, rated Tier-one. You might want to find out what tier-one gasoline is all about. I have a friend with a '95 Blazer who just buys the cheapest gas he can find, the car runs very poorly, probably a blocked fuel injector(s).
Here are a link for you. There are others but they go to car forums which I'm not alllowed to post.
http://www.aa1car.com/library/bad_gas2.htm