We will be practicing this when we start our world tour. When you boil the kettle, put enough water in for your coffees, then fill a flask so you can have another cup later on without using more gas.
Good idea Pete. This is the reason why I fitted a soft start inverter to my previous Van and purchased a low wattage Kettle to save on gas. You have enough solar on your roof and battery power. Not fitted to my new MH just yet, but once solar panels and a few other additions have been installed then I will fit it again.