If this were true, even slightly, do you not think the oil companies would market this....Espically now as super languishes in their tanks as people are looking for any benefit to their wallets...........

If your trip to work was up hill all the way there and up hill all the way home, you may have a point as you would be constantly in the retarded spark table.

 

Say what you want, doesn't change my consistant experience with two HHRs, both 2006 2.4's, over a period of two years.

BTW, why would oil companies promote a product that cause consumers to spend less?

 

I tracked my '07 vette on premium and 87 too, no difference in mpg, only performance....I run it on 87 too......

As for oil companies, they are in this to make profit. The additive package that makes premium premium costs a lot less than what they sell premium for, allowing them to make much more $$$ per gallon.....

 

The low down on premium is this.

If the car calls for 87 using high test will not increase perfromance or mileage.

Now if the car is like the SS that requires premium things change. The perfromance will increase and the mileage will increase with the use of premium.

Now you can use regular and it will not damage the engine but it will lower performance and mileage as the engine management adjust timing and fuel mixture to permit it to run on regular.

Now one point is the mileage is worse on 87 but not to a great degree. As most will point out your driving style has a greater effect than the engine managment systems changes.

So yes GDZHHR is correct in his claim of better mileage but it is small. But these days anything to improver mileage is good.

Now to determine the cost factor it all depends on the differance of price per gallon differance and your driving styles. This will vary from area to areas and driver to driver. Some may save and some may not either way the differance is small.

 

Good post, but like my vette, my 09 SS does not require Premium, it is only recommended.....87 is the minimum required for continuous use.....

Improving milage is about saving money (unless you are an environut)......Saving money occurs with the use of 87.......

 

You may or may not save depending on the price differance and driving style. There are variable factors involved that can make this a profit or loss case.

Either way the gains and losses are small either way. No right or wrong just choice based on personel driving habits.

 

Agreed....Good debating with you.....

 

I sometimes provide information without asking you first. It's a "free will" thing. However, to clarify what, to most, was likely obvious, please follow along...

1. You said you didn't hear knocking.
2. Rommer said that you wouldn't because the computer retards timing to mitigate knock.
3. You said you didn't think your computer was changing anything, and as "proof" you reference your still as yet unsubstantiated mileage claims.
4. I pointed out that a) what Rommer had already said, in that the computer is always making changes without notification or asking for permission, and I linked to a Knock Sensors 101 web site as your comment indicated you may not understand what they do; and b) I offered that it's a non sequitur to claim there is no knocking and point to your purported mileage as proof of that assertion.
5. You said some jibberish that prompted me to post this clarification.

 

We also run nothing but premium because most of the miles on our HHR SS are city miles and we do notice better mpg with premium.

 

And what does this mean for me and my SS??
Yeah..
Great thanks.