Low mpg after new cats and o2 sensors

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831rab
Posts: 7
Joined: Tue Jun 14, 2016 4:11 am

Low mpg after new cats and o2 sensors

Post by 831rab »

I recently had my catalytic converters changed out last Thursday including all 4 o2 sensors, went with magnaflow direct fit cats for my 08 srt8 challenger and now when I check my mpg on dash it reads 11.6 then drops to 10.2 then continues to drop? But I dnt have a check engine light and car feels way more responsive than b4 what would be causing low mpg?
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