I just took my 03 PT on a 2000 mile trip and averaged 27.5 mpg with the auto tran. I was very happy with that. But to have a non restrictive exhaust you need to find a hi-flow cat, from what I understand this is the bottleneck. I haven't found one as of yet.
If you unrestrict the air in and out this should help the mpg. I gained 2mpg by going to Airaid intake and dual exhaust(with Hi-flow cat) on my Dodge Ram.
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03 Electric Blue Touring PT
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