Will removal of cadillac converter give better gas mileage?

No, removing the catalytic converter will not give better gas mileage. In fact, it may actually decrease gas mileage. The catalytic converter is a part of the exhaust system that helps to reduce emissions. It does this by converting harmful pollutants into less harmful substances. Removing the catalytic converter will bypass this process and allow the harmful pollutants to be released into the air. This can cause the engine to run less efficiently, which can lead to decreased gas mileage.