If you sustitute a colder plug for octane, you'll probably notice decreased
gas milage as well as an overall sluggish feel.... Try driving the truck
with
each setup, then you'll see why they say to switch gas, and not plugs.
Cheers,
Mike V
>
> Because here in Austin, it's not .05 difference between 87 and 91+ octane.
> It's more like 25-50 cents. With the stock computer, my truck runs best on
> 87 octane. With 89 or higher I had less power and lower mileage. Why not
> spen $10.00 on plugs instead of $5.00 or more per tank for the rest of the
> life of the truck if the outcome is exactly the same, ie no ping?
>
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