What are the possible reasons for high fuel consumption?

I bought a used Sehpia 1999 - 1500cc 4cyl - 4 months ago and since then i was monitoring its fuel consumption which then proved to be very high ( 200 km / 20 liters instead of 300 km / 20 liters in high ways) , i did not check inside town. An authorised service center checked the injection system and said it is OK - but one of the cylinders is just not giving it's full power capacity. And claimed that this high rate of consumption might also be normal due to low fuel quality ( I use unlead 92 oktane type.) Now I'm confused. Can you help me please? Regards.

Anonymous Dec 22, 2008

Thank you "cargod78" for your response, but I didn't mention that I live in Cairo, It's not that cold to oxygenate the fuel, it is also brand new for me to know that higher octane has less fuel economy, it totally contradicts with our common belief in Egypt. I'm afraid that it may harm the engine if I drop to a mid grade .But I'm still wondering if there is any possible different reason? And if it's only a cylinder problem, what shall I do?I would appreciate it if any body helps me. Regards

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Anonymous

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Posted on Dec 02, 2008

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A low cylinder will cause a reduction in fuel economy. also in the winter months many states oxygenate thier fuel, it helps with emmisions but reduces economy. higher octane fuel usually has less feul economy, drop to the mid grade

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What are the possible reasons for high fuel consumption?