Fuel mileage still sucks

[Rawze]

(11-01-2021 )Lead_sled Wrote:  ...
If EGR included, do I need a kit like this one to ensure blocking? {link removed by Rawze}

that kit you popsted a link to is complete garbage!. it is inadequate and will eventually destroy your enigne!.

not only that, but you CANNOT block coolant flow thru the EGr cooler (which is part of that kit)!... it will cause 5 and 6 cylinders to run hotter than normal and eventually fail.