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Originally Posted by Anahymbrid
Actually, on second thought, 4.9 would mean 1/5 of the volume of the intake would be fuel. This would end up as raw fuel in the cylinder and would probably end with hydrostatic lockup (can't compress a liquid!).
By the way, congrats on your purchase and your first post! Welcome!
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The air/fuel ratio is by weight, not volume - so no risk of hydrostatic lockup. But I too have seen the dramatic increase in fuel consumption at cold start. If I reset the trip meter, it reads around 7-8 L/100km after 1 km, then take until 5 km to reach a more modest 5-6 L/100km. To make it really fair you should reset the trip before starting the engine, the start-up itself probably takes a few ml.