Cool,  Glad to hear it worked out, I thought maybe several tanks would be needed to show improvement. IMO, that testing station’s methods are way off base for normal operations. 
The GM recommendation of non-need of Diesel Additives is based on consuming fuel that is no longer produced, with only ULSD available now. And with claims of poor fuel on the market, use of an additive (even every other tank) may indeed be needed. Cheap insurance, I believe. 
__________________  2005 Chev Duramax/Allison 3500LS DRW Crew Cab
CAI / LMM intake OH kit, Sulastic springs, Bilsteins,
B&W 30K-Turnover GN, Putnam XDR 15K, Ride-Rite Air Springs, A/T Revos.
Pulling 10 tons daily.  2006 Chev 6.0L/4L80e 3500WT DRW Ex-Cab
9 'Flat/GN, Ride-Rite Air Springs, A/T Revos.
Pulling 6 tons daily. "The difference between liberals and cannibals, is that cannibals eat only their enemies." -Lyndon B.Johnson  100th |