What kind of vehicle? It's not likely you'll notice much difference unless you have an ancient car & a/c system. Old a/c pumps spun all the time or spun lots of mass even with the clutch disengaged. People often went so far as to remove the drive belt during winter months just to recover the 5-15HP. Modern pumps aren't bad. It'll make a difference, but it's much more effective to discipline your right foot and keep everything in tune. (plugs/ignition/O2 sensors/egr/pcv/etc)
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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