We have been using the C tane additive. Anyone one using some of the Tuners? have been looking at the predator. T weaver
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if you have a ford, it seems the SCT (NOT "superchips") tuner is the only way to go. hang on fordtrucks.com for a bit and you will see thread after thread on tuners and the SCT is always on top. places like https://www.shop.lidiesel.com/displayProduc...&categoryId=142
do custom tune files for towing/econo/power/racing. my f250 psd is still under warranttee, so no tuners for me for a while. diesels are too expensive to fix to risk voiding the warranttee.

i use diesel kleen cetane additive. works great.