Question about road bikes?

I am planning on biking the MS150 this year. It is a two day bike ride from Houston to Austin. That is about 150 miles. I currently have a mountain bike, and am wondering if I should get a road bike to help me complete this ride. Can any of you with experience tell me if I should get one? If I do, what should I... show more I am planning on biking the MS150 this year. It is a two day bike ride from Houston to Austin. That is about 150 miles. I currently have a mountain bike, and am wondering if I should get a road bike to help me complete this ride. Can any of you with experience tell me if I should get one? If I do, what should I look for? In what ways are road bikes better? Thanks.
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