2nd try on this post!
There are some other factors that will lessen the clutchless energy savings advantage, and could even make it have worse efficiency. This is even more pronounced for some of the points for a direct drive (single gear) freeway capable conversion.
- Without a clutch, you are more likely to lug the motor rather than shift, and be running it at a lower efficiency rpm.
- You lose more speed while shifting clutchess, that you'd have to reaccelerate to get back. This would be especially bad up a hill.
- With clutchless you'll be more likely to take off in 2nd gear rather than first, extending the time you are in current multiplication mode, which is not as efficient as higher rpm. Lesser motor efficiency at low rpm compounds this problem.
- You can get back a little bit of energy if you keep the motor spinning until you need to take off again
- Regen can be increased by downshifting
- A clutch can let the motor idle. There is a well respected EVDL EVer (Roland) that claims to get better range idling the motor when stopped! While I'm not sure about that myself, but it is interesting food for thought.
Most of these events would be brief and clutchless could be more efficient. At the moment the clutch lets you run in a lower gear (or downshifting isn't worth the trouble clutchless), though, then the clutched car could get better efficiency. It would depend on your driving cycle, if you have hills, if you have regen, etc.