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Weighed my wheels when I changed over from the track wheels to the normal road wheels.
I was astounded to see that I saved 1.6kg/wheel with my track wheel and tyre combo.
17x7 NCLE wheel fitted with a 205/45/17 MAXXIS MAZ1....17.6kg
16x8 FD RX7 wheel fitted with a 225/45/16 Toyo R888......16.0kg

BTW, I will have a set of the 16 X 8 wheels for sale as soon as I can get them checked for true

Stock 2002 NB8B Titanium 16X6.5 Rims with new Toyo Proxes R1R - 205/45X16 = 17.3kg

Stock 2001 NB8B 16X6.5 Rims with new Bridgstone Adrenalin RE001 (Japan) - 205/45X16 = 16.7kg

some more data points..

17x7 NC "BBS" wheel with 205/45/17 Bridgestone RE050A 15.4kg

17x7.5 Rays Engineering "Gram Light" 57f with 215/45/17 Dunlop SP3000a = 16.0kg