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ther may not be anything wrong with the car..the oil companies may be changing to thier summer blend of fuel,wich may have more alcahol in it,this would decrese you milage a little...or you may have bought gas at a different place,,,,it is probly the amount of etenol in the fuel you are getting now
just a thought,thanks
it is posble that they have already started a new blend....you could try a different company....the car really isnt doing to bad to have this average,i know you said it got a lot more before...but this is still decent for a v-6