- Buick Ownership
Since this discussion came up, I've been shopping around for medium/high-test gas. There seems to be a general rule around here (Ohio) that the advertised price of 87 octane has no relationship whatsoever to the price of the higher test fuels. Most of the gas stations have a sign advertising the price of 87 octane that is at least somewhat consistent with the local market. You have to pull up to the pump to find out just how bad they're going to gouge you for the good stuff. Costco is the only station I've found around my area where they don't jack it up by 80 cents or more.You may not notice any difference in performance or milage. You may not notice a thing. With these DI motors they will produce a lot a carbon build up. With the cleaning properties of a high test fuel it will keep the carbon build up to a minimum. Also, people read the manual and see it says 87 octane. Yes, it says 87 or higher. I have owned a total of 4 cars that have the DI motors. None were brand new. 3 had 7000 miles or less when i found them. I would bet they never had high test run in them. The chrome tip on the exhaust were as black as can be. After cleaning them and thousands of miles later they were never that black again. I do not run high test exclusively. But it is my choice Most of the time. I also run Techron fuel additive that i buy at Costco also as a cleaner.
I know very little about E85. I'm under the impression that it is 85% Ethanol. Because I'm 100% against the whole 'burning corn" thing, I have no plans to willingly put it in anything I own. The newer technology may allow for it, but I've seen too many engines/carburetors/fuel systems/ damaged or destroyed by even the smaller percentages of Ethanol that has been added to our motor fuels.Sorry i would never burn E85 in anything i own. In my opinion there is no advantage in that product Waste of money.