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Guys the 80% is wheel to wheel. Not wheel to accumulator, make that 90+%. Heat losses from the compressed gas in the accululator would be a factor over time but that assumes a completely discharged accumulator and no insulation factor over the pressurized gas portion of the accumulator.
The accumulator can discharge completely in seconds, try that with a battery.
One 0-60 stop is the amount of energy needed to maintain 60 MPH for .7 mile.
Comparing batteries to accumulators is false logic. An accumulator is more like a capacitor, and remember a properly designed HH would weigh the same or less than a conventional car. There are even HH bicycles.
Long term storage is the batterie's forte, as far as energy density, while an accumulator has a practically unlimited durability and when the bladder wears out it is easily rebuildable.
If you want a limited range use a battery for your consumable energy storage, no law is written that limits a HH to an IC engine. In fact you could have exchangeable power modules of both types, or if you want increased vehicle weight both modules could be in the vehicle all the time.
Accumulators could also be designed differently to incorporate them into the vehicle's structure. You won't see that with batteries in our lifetimes.
regards
Mech
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