I'm getting 12 img per action on pigs, 48 total. My img goes up well enough at least. On streets with alot of pigs, I've come out with over 1,000 once in a while.
Well, I saw a person donate just MEAT to a Zille Shrine, and got 30,000 iMG out of it. Also, I'd normally make Fruit Tree Beans. Make them and they give 2400 iMG per 40 Beans, then you can donate with ESHP.
20 Gas Beans will give you apx 1620 iMG 900 Favor
20 Fruit will give you apx 1980 iMG
600 will give you 3950 iMG 1800 favor..and so on. Test things out and see how ya do. Tis fun (Disclaimer: does vary sometimes give or take some pts. Plus you get iMG pts for making the beans etc.)
1 Animal Potion will give you apx 1000 iMG 420 Favor