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Catalytic converters & Gas Mileage


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Got a question lookin for a little help....got an 05 z71 that has always got 16 mpg no matter how I drove it. A few months ago it started acting up and got so bad that it wouldn't pull itself and was getting around 10 mpg. Put a new MAF sensor on it but no change. Finally cut the catalytic converters off and now she runs like a top but only getting 12 mpg. The engine light came on and showed one of the o2 sensors were bad so I replaced it as well. Still not getting the mileage I'd like to get. Ive cut the cats off of two of my previous Z71s and actually got maybe a half a mpg better so I don't really think putting new cats on it will fix it. I've checked spark plugs and air filter and all are okay. Any suggestions fellas? Thanks in advance

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well if the cats were clogged your mpg,s and power would have suffered bad, I always remove them but you also might not being seeing the better mileage because your foot is into it a little more..

Put a new cat on it with the new sensor and see,

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