[lstowell]

agree fully! its probably all in my head also! next tank will be 89

It could also be related to the local altitude and the gasoline area you drive in.

At higher altitude, 87 is the midgrade [pump method].

If you are around LA, I have no idea what sort of witches brew they put in the gas there, but it drives like [censored], and the premium seems worse than the regular.

 

[lstowell]

Around here it's usually a 10 cent difference. Break-even on mid grade gas would be about .5 or .6 mpg at that point.

I guess pre-detonation ping has not been a problem for users of regular octane gas in the 5.7?

No, it doesn't ping. More correctly, if it does the control computer catches it long before you would notice it.

You could likely run the thing for hundreds of K miles and not hurt a thing, and without a stopwatch probably wouldn't notice any differences in performance as it dials back just a teeny amount.

... I still use midgrade, only 10c difference.

 

[lstowell]

idk about the swag method..

anyways I have always run Shell 93 octane. she seems to love it.

Doesn't really need it, but I tend to put at least half a tank of Shell premium in every couple thousand miles. Don't see any difference in behavior from Conoco/Phillips, Texaco, Chevron, etc. midgrade. Haven't tried the nitrogen enriched.