They look kinda heavy if you could live with 42-45c you could save about 300g on each tyre
https://www.specialized.com/gb/gb/bikes/mountain/fatboy/105952
http://www.somafab.com/archives/product/shikoro-700c-clincher-tire
http://www.somafab.com/archives/product/supple-vitesse-ex-700c-clincher-tire
Fatboy might be the best option from those, as much as I love the Soma tyres £50 a pop for the commuter is too steep.
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They look kinda heavy if you could live with 42-45c you could save about 300g on each tyre
https://www.specialized.com/gb/gb/bikes/mountain/fatboy/105952
http://www.somafab.com/archives/product/shikoro-700c-clincher-tire
http://www.somafab.com/archives/product/supple-vitesse-ex-700c-clincher-tire