MPG of a studded, deleted, and tuned 6.0?

[2004F250XLT]

Whats the avg fuel mileage increase with a 6 liter with a 4'' straight exhaust, studded, full egr delete, good custom tune, and all proper fluids? Basically asking the mileage increase with all the bugs worked out, Assuming with proper gearing and stock tires and being 4 wheel drive. What should i be expecting. Thanks

[custom4584]

I've seen 22 highway with 4" turbo back, 58v ficm, and egr delete. Stock tune, 3.73 gearing with 275/65r20 tires.


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[HAM_RADIO_MAN]

My MPG seams to have gone down a little with the EGR delete. Mods are in my Signature. I am getting about 15 city and 19 to 21 on the hwy. Above 65 on the hwy my mpg falls pretty fast

[2004F250XLT]

Well something must be wrong for the mileage to be negatively effected be an egr delete no? I plan on getting an egr delete and replacement oil cooler from alligator performance, hoping for slightly less fuel consumption and a healthier engine.