I have the same Titan tank as Seann45 and love it. Will it pay off in savings from buying at cheaper stations, probably not, but I do have the option to buy at those stations and we all know diesel does vary station to station much more than gasoline.
My tank holds 52 gallons. Not long after I got it I put 5 gallons in a can in the back and ran the tank until almost empty. At the 50 gallons used on the DIC, I gave up and put the five in and then went and filled up. I wanted to make sure the bigger tank was in fact being sucked down and that I really did have 52 gallons.
Would I do it again? You bet!
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof