>>> Yi-Ruey Wei <ray.wei@US.PWCGLOBAL.COM> 09/14 2:54 PM >>>
   Of course avoid the RFG (Reformulated gasoline) if you can.  If you
check the owner's manual of the older cars, it will say DO NOT USE any gas
which contains MTBE (the major additive of RFG).  The RFG contains 10 - 15% of MTBE which not only harden your rubber parts but also worsen your gas mileage (only 85% of the RFG are "real" gasoline).  MTBE is also
contaminating our precious ground water too.
>>>

Yickes!!! easier said than done.. try living in California.. you have no choice.. All gas sold in this state since Jan 1996 containes MTBE.. it's suppose to help clean up air pollution.. 
..so the question is do you want to die breathing the air or drinking the water?

Yau-Man Chan
87 GL