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2013 GMC Seirra 5.3 with no acc on in park. I recently measured at 1.919 LPH after a thorough warmup from a stone cold start. The fuel burned to get the engine warmed up is mind bogling at a total of 3 Liters in 18 minutes. Where a hot engine would only burn 0.58 liters in the same amount of time.
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