Well, I finally received all the statements for the charging that I used on this trip. For the exactly 200-mile one-way distance, not counting starting the trip fully charged from each home, I paid $21.24 going and $23.57 coming, for a total round-trip energy cost of $44.81. This included NRGeVgo's FLEX plan (no monthly fee, $4.95/session plus $0.20/minute DCQC, or $1.50/hr L2), BLINK's plan of $0.49/kWh, an unknown outfit that charged $1.00 for a DCQC session in Benicia, and free DCQC charging in Davis.
The BLINK network charges by the number of kWhr consumed, which at $0.49/kWhr I consider a fair price. On the other hand, NRGeVgo has a number of plans, none of them cheap, and they provide no data on energy consumed. https://www.nrgevgo.com/san-francisco-bay-area/
My wife drove our Gen1 Honda Insight (77mpg) on the same round trip. Even if gasoline had been at $4.00/gallon, that 400-mile round trip would have cost $20.78.
Would I do it again? Let's see…
It took eleven hours (going) and nine hours (coming) in the EV (could have been reduced to about 7 hours) instead of 3-1/2 hours in the hybrid
It cost $44.81 for the EV instead of under-$20 for the hybrid
The eating-out cost was higher because of the longer trip
It was a fun experiment, but with the sparse availability of CHAdeMO outside our SF Bay Area and the high DCQC 'fuel' cost I think I'll simply consider our new used CHAdeMO-equipped i-MiEV as our intermediate-distance vehicle which we now take when driving outside our home-charging range.
If our lifestyle entailed lots of long road trips, I'd get a Tesla