View Stat Averages Spreadsheet
Click this link to view the averages I've collected so far.

For all items with varying stats or xp gains, I have provided ranges, and will provide the best guesses as to the averages once more information is collected.

All the links will take you to the item's page in the catalog. This will tell you where you can find the item and how many are currently in the game.

All food and amusement items have a small chance for giving stats. These are only the items that have high chances of giving them.

Notes and data collection are at the bottom.

XP Items

Giant Tortoise- Gives 400-800 Xp. 1 use.
Broken Drone- Gives 50 Xp. 1 use.
Coconut- Gives 50 Xp. 1 use.
UAV Drone- Gives 20 Xp. 1 use.

Food
Egg Yolk- Gives 0-15 stats (typically 0-4). 3% hunger. 1 use.
Honeycomb- Gives 0-6 stats. 15% hunger, 10% mood. 2 uses.
Turtle Eggs- 60% chance for 1 stat. 20% hunger. 2 uses.
Crocodile Eggs- 0-1 stats. 20% hunger, 20% mood. 1 use.
Longfin Eel- 0-2 stats. 20% hunger, 5% mood. 2 uses.
Hippo Fat- 0-1 stats. 20% hunger, 10% mood. 1 use.
Fluffy Bunny- 0-1 stats. 20% hunger, 10% mood. 1 use.
Small Turtle- 30% for 1 smart. 10% hunger. 1 use.
Juicy Lizard- 30% for 1 speed. 5% hunger. 1 use.

Amusement
Dry Palm Leaf- 0-2 stats. 30% mood. 5 uses.
Kudu Horn- 0-2 stats. 30% mood. 3 uses.
Lovebird Plumage- 0-3 stats. 30% mood. 2 uses.
Ostrich Fluff- 0-1 stats. 30% mood. 3 uses.
Camel Toes- 0-2 stats. 30% mood. 1 use.
Flamingo Legs- 0-2 stats. 30% mood. 3 uses.
Cub Training
Medlar fruit- This raises your cub's experience bar by 5%.

Notes

While Giant Torts provide far more Xp than drones, they are much more expensive, typically running at 1-2 GB vs 200 sb for drones.

Most food items are found in the February shops and nowhere else, but they typically stay around 1 GB value all year. The preferred stat food will be your egg yolks and honeycombs, They are typically a lot more plentiful, though they do go up in value outside of the events. Egg yolks are used most often since they they only give -3% hunger, which means a lion can be fed as many as 7 per day. However, they have high fail rates. Honeycombs are considered to be more reliable, but they give -15% hunger, so only 2 can be fed per day. Unless you can afford to feed a lot of yolks, combs are the better option. Be careful when buying them, because they will expire like any ordinary food.

Palm Leaves and Kudu Horns are the most common amusement items. Palm Leaves are a World Drop during December, meaning you can find them through Explore, and there's a chance of winning Kudu Horns during the May championships. Both can also be bought from the February shops. However, Lovebird Plumage gives the best stat average.

Other Guides

I would recommend this guide for some figures on leveling up using torts, and this one for stat gains and xp needed.

For anyone starting out in stats, I'd recommend the Mad Statters Guide and the Striving for Stats Guide. I don't think either clan is open anymore, but the guides are good :)

If you're interested in how many stats regular food items give, check out these guides by Berenos and BrokenBrookieCookie.

All of these guides are fairly old, so they should be fairly accurate but maybe not 100%.

Data Collection

So, we know the stat range for all of these items, but I'd like to find exact averages. For an accurate percentage it is best if you post every time you use an item instead of only when you get stats from it. I do NOT need information on the following items:
Broken Drones, Coconuts, UAVs, Turtle Eggs, Small Turtles and Juicy Lizards.

If you want to contribute, all I need is
Item used:
Xp or Stats Gained:

This guide was based off this one, the only reason I made this one was in the hopes to get accurate averages for stats/xp gained.