@JonD The only thing that comes to mind relates to what you said about the heat colours... As Lampies, we sometimes fine tune things to get the most out of a lantern... Do you think that your Tilley is running hotter than it should be?.. i.e. than it was designed to? Does anyone know if the 'newer' burners (X246b) burn hotter than the older ones? (Guardsmen) Is the further the colours travel down the vapouriser a fair indicator of how hot it's getting?