Scrap the 160 thermo - wayyyy to cold for everyday driving. You're probably running too cold, therefore staying in rich mode which is contributing to your poor gas mileage.
Move up to a 180 thermo and see how it performs.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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