From: dannyb@panix.com   
      
   In  Stephen Sprunk  writes:   
      
   >I'm not sure about unburned fuel, but an ICE has uneven power output;   
   >higher RPMs mean lower fuel economy.  That doesn't apply to electric   
   >traction, however; output is the same regardless of motor speed.   
      
   It's not necessairly "higher RPMs". It's more that   
   the ICE's are optimized for a "sweet spot" where   
   they get the best efficiency.   
      
   Lower RPMs can be bad, too...   
      
   The related problem is that during the speedup/slowdown,   
   there's even more ugliness until the engine stabilizes   
   at the new speed.   
      
   - This is a BIG advantage of (properly designed) hybrid   
   electric-gas cars. The ICE output remains a lot steadier,   
   and speed changes are slower. The electric motor   
   does the tweaking...   
      
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