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If the tyre-tyre friction drive has a potential to work good, it is off course well suited for ICE-electric hybrids as well. With an efficient electric motor/generator of proper size and a quite small but efficient battery pack it may be possible to make a semi-hybrid that can be combined with the good old Pulse & Glide driving method without getting these annoying variations in speed.
Such a system only needs to keep the car at a steady cruising speed for perhaps 5-10 minutes while the ICE is shut down. When the batteries are nearly drained the ICE is started and the 5:th wheel motor is used to charge the batteries again. This will increase the load of the ICE, helping it to reach BSFC sweet spot without too much acceleration or light but inefficient throttling.
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