I can see that in northern climates but I wonder if they do that in central
Texas? Something is different. Truck makes more power but wants to knock on
87, lightly though but I can hear it.
Andy Levy wrote:Many places use different gas formulations in the winter to
make friendlier
> emissions. Side effect - you get worse mileage, so you probably turn out
> MORE emissions overall.
>
> Jim Miller wrote:
>
> > In the summer my R/T runs pretty well on 87 but in the winter it will
> > knock
> > unless I use 89. Could it be that cooler air in the engine causes more
> > spark advance?
> > JIm in Waco
> >
> >
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