Quote:
Originally Posted by abently
Its actually surprising that so far, no one has been able to answer conclusively the question of how 'lean burn actually saves fuel?'........
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That's easy. You're forcing the throttle to be more open in order to get the engine to do the same amount of work as before. That reduces throttling losses at the throttle plate, and reduces pumping losses in that your engine vacuum is lower than before.
Shrink those two losses, and you shrink the total amount of load placed on the engine. Shrinking the load means using less fuel.