I commute into Washington DC about 8 times a month - 64 miles round trip in HOV lane... You live in a fairly large hot city... Do you encounter much stop and go traffic? Last thursday, I sat in a 5 mile back up moving 20 feet at a time - Sucks. It's also hot here in the summer and I was cooked to medium well. Twenty more minutes and I would of probably had heat stroke. Just something to think about!