The preservation chance is a modifier which lets us preserve the resources used when creating items. As a return, we will be able to make more items, entirely for free!
Note that the preservation change does NOT affect the usage of potions nor summoning tablets.
The preserve chance is capped at 80%, and is additive, regardless of source.
Calculating gains
Math:Resource Preservation
Obstacles
Runic Trail mostly affects Summoning stuff, and should NOT be used when doing Herblore.
Cave Waters affects Potion charges. Do NOT use it in Herblore. Similarly, Rune Crawl spares your tablets, but is bad for potion consumption. Tradeoff.
Cave Trap is actually BAD for resource usage, but will spare you potions and summoning tablets.
Obstacles but combat
Ammo and rune preservation. Also Prayer stuff. Read notes specified above regarding tradeoffs.
Pets
Puff, the Baby Dragon
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+10%. Only affects Smithing
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Gunter
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+10%. Only affects Runecrafting
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Monk-ey
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+10%. Affects Prayer. Eh, that's not an item.
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Norman
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+3% Prayer points. Still not an item.
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Jelly Jim.
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+2% rune preservation. For real, these are not items.
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Salem
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+5% rune preservation. I guess runes are some form of item...
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Arctic Yeti
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+2% ammo preservation. Stop adding combat stuff here.
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Mark
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+10% summoning charges. I'm actually just gonna add them regardless.
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Harold
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+3% ammo/rune preservation. +3% potion preservation.
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