For heating alot water get a heat exchqnge pot. They are not new tech, its over a century old, and still comes bqck for one reason, they work, the weight saving calculation is the only thing to think off.
The most difference you will see with a heat xc opt or kettle is a roarer burner and small pot ie jet boil, being as the msr is a bit more civivsed it will not be as great, but it is still worth it if you are going to use alot of fuel
1 litre 292g
So ab9ut 120g in it, but the primus has got to be around twice as efficient, but i stand to be corrected
so if you plan on using more than 1/2 a pint 227g it should be worth it.