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The inefficiency of the catalytic converter won't affect your fuel mileage unless it's stopped up. Back in the 70's & 80's when it was still legal to remove them from your own cars I removed them from nearly every car I owned and burned leaded gas. Some people used to say removing the converter would help fuel mileage, but I never saw an increase in mileage it was just that leaded fuel was less expensive than unleaded. This was back in the days when $.60 a gallon was highway robbery. Probably 75+% of the members on this forum don't even remember those days, if they were even around they were still sh1tting their pants.
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