Yes, and if speed and total miles per day are not that important to you, there's no reason you shouldn't go for it. My first long tour was on a old 18 speed mountain bike. I went approx. 1400 miles. Because I was time limited, I did upgrade my gearing and swap my tires to slightly narrower off-road versions, which didn't cost me very much, and I still ended with a 85 mi. a day average while carrying an extra 50 pounds gear. (I was in great shape then) If you are in average shape, 50-70 mi. a day is quite achievable, especially if you are comfortable with your bike. You definitely don't need a fancy touring bike, just make sure your bike is in good mechanical shape.