It sure sounds like your 1.5 hour commute could use a 3.7v bottom feeder with a freshly charged 18650 battery. You would have plenty for both commutes, plus your work day.
Imagine an ego with a 1.7v single coil carto (that is what I use on my bottom feeder) with a 6ml bottle attached to it. One quick pump is like putting 6-8 drops directly onto the coil in the carto. Its working sweet. No hastle. I just fill my bottle every 18 hours or so, and charge up my batt each night when I get home. Of course I carry an extra 3.7v charged spare batt and carto, but thats it.
What I was using before holds a 18650, and they truly are go-forever beasts. Definitely a wonderful battery to work with. And definitely been eyeballing those Foxy Customs... gorgeous pieces. Always wanted the hassle-free nature of a bottom feeder, anyways. But then again, 5v may have me ruined now. I know a 3.7v with a LR 1.7 on it should be about the same, but I may very well have found my sweet spot. But then I'd like to try a VV, as well. Man, I sure do want a lot! Decisions, decisions! Will have to start putting hints in to the wife soon. "Christmas sure is just around the corner, hun..."