Sorry, the picture is a bit misleading. At 98% through 72 I returned to town to turn in, and the 1.2M xp/hr is an inflated rate due to me logging out after turning in quests. I average ~400k/hr so you're not far off the mark really. What it comes down to is knowing quests (I have 2 80s already, so I know most of them), and since you hit 80 a lot of them should be familiar.
I typically run to a quest hub, grab everything, look at QH, then kinda relate those quests' positioning to quests from other hubs. A good example is Howling Fjord, where from the starting area if you go clockwise through the zone, you hit almost every single quest without breaking a sweat.
With RAF the 3x xp bonus is applied until one toon hits 60. You can make a trial account for free, link it to your main account, then just /follow the main account toon with the trial. Better yet, if you have a friend one of you can do this while the other runs the lowbies through zones for ridiculous xp. This is essentially what I did from 1-58. If you look at my achievements, I've done 10 eastern kingdom quests and 0 kalimdor quests. Hence the power of RAF