just picked up a few 250g cans from mitre10 mega, cost about $6 ea (not much more than wholesale price)...... hardly worth the risk of my face sluffing off over being a $6 tight arse.
If you use a remote canisiter and can invert it then you'll get the most out of it. But yeah the "how long will a half full can last? " question will still be there. unless you can weigh them?
The lightweight hiking guys in the US are getting 20-22 1liter full rolling boils using the remote burners/windscreen/Heat exhanger pots and 250g cans.
GEAR » New Stove Gear: Fire Maple 117t and XK6 "HE" Pot -- BackpackingLight.com Forums
Pretty reasonable pricing on these too, while still being really light. full set up including a full 250g can is about 500g.
http://www.fire-maple.com/en/productsinfo.aspx?pid=8
http://www.fire-maple.com/en/productsinfo.aspx?pid=30
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