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By my math, grid charging my 1KWh pack could save me around 0.04-0.06gal of gas per charge, depending on what depth of discharge is achievable. Whether or not that is tiny is debatable.
For me, on my daily commute of 11mi each way, it would be around a 15% drop in gasoline consumption if I charge at home, or a 30% drop if I also charge at work. Expect a smaller benefit in the winter due to diminished battery capacity in cold weather.
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