I also learnt speed reading. Had a relatively high reading speed of 340 wpm and did the Mega Speed Reading course... in the end my speed was just on average of 250wpm... yep lost speed tried like the devil to get it back up.
Found PhotoReading and the idea that I could finish 3 books in the time that it took me to finish one sold me. Only to discover it gets even better than that 
Rapid Reading... imagine a kayak on a river... some parts are slow others are fairly fast and others you definately don't have time to look at the scenery you're moving to fast. What dictates the speed is the section of river you are on. That's rapid reading... like crusing down a river reading the book from cover to cover (or chapter from beginning to end). Your speed varies according to how the imformation moves you.
Alex