Re: Gas mileage
I was always taught to check the basics; air filter, plugs (and gap), wire set etc... When I changed my plugs (and there are MANY posts on plug types and gaps), and put good wires on (also many posts on the poor quality chrysler wire sets), I notice a great improvement in performance.
Also look around at all the vacuum hoses to make sure their all connected.
Don't expect to get great mileage; I've got 100K miles on my 03 GT and usually get about 26 HighWay and 23-24 mixed. It sucks but I've read worse.
15mpg doesn't sound right, even if new but check the basics.
Post back to let us know how you made out....
Good Luck - Duff
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