Indeed, best solution is to use lightweight inner tube instead, like the Schwalbe XXLight.
Really? To make a butyl tube lighter, presumably it's thinner: ie less puncture resistant.
They're more elastic, i.e. more flexible which mean less risk of puncture.
It only work best with high end tyres IMHO.
@Scilly.Suffolk started
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Indeed, best solution is to use lightweight inner tube instead, like the Schwalbe XXLight.