I've been off the bike for a couple of years and want to get back to commuting so as to lose weight. My commute is about 31mi each way. Should I strive to do this both ways a few days a week or is that too much of a stretch to be be reasonable? Riding one way is no problem but that doesn't avoid driving and usually results in logistics problems with clothes etc. I'd have to do this by myself unless there's someone here who wants to commute from around Nashua, NH to Burlington, MA.

I do have other options- taking the train or a commuter bus but each of these options would run about $10 a day and require me to ride a folding bike. I do have a folding but but it's not really fun to ride. My commute at each end of the train or bus ride would on the order of 10 miles so taking the bus/train really only knocks about 8-9 miles off the ride and would likely take an extra half our or so.