It's right about at that crossover point now where I choose to drive my electric car on my non carpool days versus take the motorcycle. The bike is considerably faster with carpool lane, but the electric car is "free" with all the solar.
Work is 100 mi round trip, and considering the extra delay for taking a car, about a dollar a minute is where I personally decide that it's better to suck it up and sit in traffic with the car.
Part of the problem is my bike gets maybe 30mpg, and I drive it like an absolute tool, but hey, that's what I bought it for.