Quote Originally Posted by pitbullz
low idling-fuel efficient but may cause shakiness due to insufficient rpm's may cause the engine to stall when all accesories are operating...

high idling- too much RPM while idling..impractical and stupid...
These are effects.


Arithmetically:

High idling = 1,500 rpm
(minus) Low idling = 700 rpm
---------------
Difference = 800 rpm