Edit - also surely mean you need to average 7 people as when it's full it'll be a little over 12 times as efficient as when there's 7 people. So it could run for 10 minutes full then about 2 hours completely empty and it would balance.
No i meant 7 cars worth of people. If a bus can displace 7 cars then it is only equal in efficiency. This applies to hybrid buses too as they only get marginally better performance per energy needed to use.
So you'd need the bus to have 10.5 people at all times? But why doesn't an average capacity work? Do you have an figures to back so this up, especially the hybrid bus claims?
I don't know how it is in other places/countries but in Paris (inside and in the ≈ 15km area) , clearly, there is always at least 10 passenger in the same bus, I would say 25 average and at the peak hour an easy 50.
So I think buses are still an energy efficient transport, at least in some places.
Which is really just a bad choice. We could have proper town planning if we wanted, and in fact we used to have it. But then we knocked down neighborhoods to make room for highways and that was that. We can work our way back to good towns of any size, if we wanted.