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On my car at idle I save only 2% going from 14.7:1 A/F to lean burn 20:1 A/F.
At idle I can't run any leaner do to the lack of turbulence in air flow.
At 55mph I save 29% going from 14.7:1 A/F to 33:1 A/F. Plus the amount of fuel weight used at 55 mph compared to idle is massive.
My best savings at idle is when I shut the engine off. So I turn my engine off a lot instead of having it burn fuel at idle.
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Pressure Gradient Force
The Positive Side of the Number Line
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