I've been performing the tedious task of seeing how long my stoves actually burn on a full tank at a full flame, but not pumped to the max. I am getting 4 full hours on 1.75 pints of kerosene in my 5S with a standard roarer. This is double what the mfgr suggested. I would like to hear others' experience. Tks DTE
@Mcbhaine As far as I was aware, the No.5 models were all fitted with silent burners, so not sure what factory figures would be available for a No.5 with a roarer as you describe. Maybe I am wrong, it does happen frequently! The No.1 had that same tank with a roarer. You might be better to compare the advertised figures for fuel consumption /performance for one of those.
I think most designation numbers remained the same between the Primus and Optimus brands as well as some others too, with the exception of the PR 210 which translates to the Opt 00. Indeed, post 1962 and the Primus Trading Company, the stoves were the same apart from their Primus or Optimus brandings.
