I believe the MS150 (Houston - Austin) is actually about 180 miles over 2 days. Thinking about doing it next April. I'm generally fit (aerobically), but only recently came back to cycling. My average ride has been only about 25 miles at about 18 mph. Longest was 30 miles at 20 mph. Other than just riding lots, I'm wondering what you have found as an effective training protocol.

I've read the following and make these notes:

The Complete Book of Long Distance Cycling (Ed Burke and Ed Pavelka)
- This has the training protocol that's most specific to my goal. The 10 week training plan builds up from about where I am now to completing a century. It basically adds 10% distance every week.
- I'm surprised how short the training rides are except for the once-per-week long ride.

The Cyclist's Training Bible (Joe Friel)
- Really like this book. Learned a lot. The idea of working on limiters makes lots of sense.
- But it's more geared toward racing and doesn't really address how to build up to a specific distance target.

Smart Cycling (Arnie Baker)
- Lots of good general info on training.
- Has a 12 week stationary trainer workout which is for general winter training.
- Was least specific to training for a particular goal.

I'm already building some of these principles into my rides / workouts. But I'm wondering if any of you have used these particular training methods and how they worked for you. Or if you have other tips for training for such an event.