I have Fueling issue

Chevrolet Aveo 2011 Hatch back 1.6 6526800 miles
My Aveo hatch back 2011 1.6 consume more fuel. Send it to my mechanic to check on it he said I should check if the converter catalyst is working properly, I sent it to exhaust specialist to check and he conclude that the converter catalyst is spoilt so I have to replace it. Please could it be the reason why it consume more fuel? I need help
Nanayaw from other 2 years ago  
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