Ooh and never feed your horse past 1000, it is a waste of stones. Also, the food feeds in increments of 100. So if you feed him up to 915 (just an example), wait until he goes lower than 900 to feed him again.
KQs give a lot of exp at the ending, if they're successful. It may or may not be more than soloing/questing depending on the KQs max lvl and your lvl. You get exp during the KQ too.
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Credits to Loveless for the great signature!
We rode on the winds of the rising storm
We ran to the sounds of thunder
We danced among the lightning bolts
And tore the world asunder