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mileage problem

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i have an 07.5 2500 with a 6.7L... I did the DPF/EGR delete with smarty jr tuner... for the first few months everything was awesome, i was getting 16.5 average mpg in town and close to 20 on the highway.. for the past few months in town, it has gone down to 11-12 and the highway is still decent around 17.5-18. I notice its especially bad on fuel at idle and on acceleration, drastically worse than it used to be and im babying it now..power is maybe a little sluggish too, but not so much that i can really notice it. I have replaced the air and fuel filter to no effect. anyone have similar issues? not really sure where to start now. help

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