by XS11E <xs11e@[EMAIL PROTECTED]
>
Apr 6, 2008 at 04:39 PM
CR <var@[EMAIL PROTECTED]
> wrote:
> My '06 MX5 runs OK on mid-grade, but it's a lot more fun with a
> tank of premium!
>
> I wonder if there is a significant difference in MPG between
> grades of fuel?
Yes and no. Vehicles equipped with knock sensors will retard the
ignition timing when knock is detected and that will reduce economy and
performance. If you drive with a very light foot so as to never cause
the engine to knock there'll be no difference between fuels but... If
you drive with a very light foot, why did you get a MX5? <G>
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