I use the lightest little camping stove I could find, a tiny titanium one from Kathmandu. This little one weighs in at 50g.
I did read about fuel efficiency and burners in this advertorial piece here :
They’re spruiking the idea that their stoves are 50% more efficient so you only need to carry half the gas. I’m wondering if this works out lighter in the long run because the unit itself would be heavier.