how much will having NO catalytic converter decrees my gas mileage?

Drew

New member
I drive a 1991 Dodge ram 150 and my gas mileage is HORRIBLE they say there get around 14-15 MPG which is bad enough but mine is getting 6-7MPG the previous owner took off the Cat converter so it would sound louder is the reason for my huge drop in gas mileage ?
 
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