Causes for lowered gas preformance?

[pb3vr6 at yahoo.com (Tonee Northam)]

The right foot being larger or heavier than the left.
   
  Atleast that's what my problem is.

Neptuno <neptunonc@yahoo.com> wrote:
  Like the tittle mentions:

Quick people what are the main causes for lower gas performance?
The car is running smooth. There is a leak at the muffler, but does that matter?
It was timed last this past summer at Dan Bubbs or was it last year?

Thanks,
EL Tony

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