Christ, you are dead wrong about the calculations. The amount of fuel consumed is no way as high as you have assumed. A typical 1.5L idles at a rate of 0.3 gph. so for a 1L, it will be 0.2 gph or roughly 750 ml/hr. This is 750 ml/60min = ~12.5ml/min/L. A typical idle rpm value is 700, and there is a intake once every two revs. so 350 intakes = 12.5 ml. => 36 micro-liters per stroke / liter of cylinder volume, for idle. This could go higher as you open the throttle, but not THAT much... Your figures are off by a factor of 1000.
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