i gutted my catalytic convertor, will that reduce my gas mileage?

2003 FORD RANGER
210,000 MILES
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BG41
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gas mileage went from 22 mpg to 14 mpg after gutting convertors. Or could it be something else?
Dec 9, 2011 at 1:31 AM
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HMAC300
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scan the engine gutting the converter has ne effect on mileage unless it's plugged.
Dec 9, 2011 at 1:39 AM