Measuring rest state + gatherer's grace II + food and variations of such
I spent last night questing and grinding in grade 5 nodes in Treespeak and Hala as a lvl 48 miner to find out if rest state and gatherer's grace would stack and how that worked with mining leve quest xp.
I haven't reviewed the numbers yet, but I'll post it up here after I have some coffee.
If you'd like to look at them you can see it on Velve's Lodestone blog
I have a suspicion that what I wasn't tracking is the biggest bonus for stacking rest state and gatherer's grace. I went from the start of lvl 48 to nearly the end and was in rest state the whole time. Maybe gatherer's grace extends the length of rest state? or vice versa.