I did a rear seat and interior removal along with some tools and other junk I never use. which equalled about 70 lbs. (I have the exact totals in another thread)
On the exhaust I replaced my whole exhaust. The cost was about $190.00 total. Make sure your cat. converter is still on. That makes a big difference. I also stayed with the stock size exhaust. No cherry bombs or exhaust tips.
I have also noted that when I increased the tire size alittle 175R vs. a 165R my MPG increased a few MPG. This might help the cause. Good luck and welcome .
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Brian
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