IMO, Hook’ems link in his post #2 is more informative on what was tested good to use.
I think our concerns are USA’s fuel quality which we know sucks compared to other countries. where good lubricating fuel additives are a must.
I like Diesel Kleen with slick 50 and Cetane boost.
Lucas has IMO good lubricating and injector cleaning but that’s about it.
On my Dmax I tried both separately.
DK alone my mileage increased very little with cetane boost but the injectors had a little more clatter.
Lucas alone there was no mileage gains but the injectors was quieter.
I actually started to mix both back in 03, for me the best of both worlds, with a cost for additives at about 4-5 cents added to the per gal cost.
My previous diesel 03 6.0 PowerChoke had to be torn down a few times.
The diesel mechanic mentioned he hasn’t had any engines injectors as clean as mine was with my mix.
In Lake Havasu a good number of diesel owners use old grease, he’s found small chunks of chicken fat clogging the injectors.
Not a very good comparison old chicken fat grease mixed with diesel to a actual additive in diesel.
Dan 2007.5 GMC Sierra 3500 SRW L.B. "BLACK" C.C. 4X4 LMM Z71 DIY stock airbox mod, aFe ProGuard 7, OEM drop-in
EFILive ECM ATP - Heavy Tow Tune with Turbo Brake.
EFILive TCM Duramax Tuner
DHD Cold Side High Flow Intake Pipe
DHD PCV Re-Route
AirDog 4G100 2007 Yukon Denail "BLACK" 6.2 gasser DIY stock AirBox Mod, K&N, Airaid intake, EFILive TCM only tuning