.4 miles on a way too small single speed. 2 miles on the Trek 7300 I bought last fall. Most beginners use too high of gearing. Do yourself a favor and stay in the low speed gears. Turning the pedals faster with a light load will allow you to go farther and be easier on your knees.
http://www.bikeforums.net/showthread...e-for-a-newbie is a good thread where this is discussed