according to the shop book, wrigley's extra ice sugarfree gum (closest one that's in there) is 4PP for a 56g packet.
I don't really understand how sugarfree gum can have points in it, don't think I'd bother pointing it to be honest, but I don't have chewing gum often!
In the shop guide, most sugar free gum is 1 pp for the whole packet- ww sugar free sweets are the same so makes sense. But, some sugar free mint were 7 pp for the packet - I was so shocked. Surely its a mistake???