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Since a V8 engine burns .5 gph idling, adding ac to that waste only makes the waste becomes worse.
I would rather add that to best bsfc load and take the slight load penalty becoming longer duration of the acceleration event. Remember my car will go 35mph on .5gph, while the V8 will not move.
Stating that adding ac when idling means that V8 is now using .75gph, not moving at all. When it could easily (over powered as it is) run the compressor without a significant change in acceleration load and a minuscule additional amount of fuel.
AC on idling would be my LAST resort.
regards
mech
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