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Cause of high fuel consumption in Grand Carnival?

The fuel consumption of my 2010 Kia Grand Carnival V6 is poor; I only get about 500 km from a tankful. Any ideas of why it is so high?

If you're using mostly it around town, as I suspect you are, the consumption is about what I would expect.

Kia's own claims for fuel consumption for urban (city) use is 15.1L/100km, and the driving range is a little over 500km, smack on what you say you are getting.

The average of combined urban (city) and extra-urban (country) is claimed by Kia to be 10.9L/100km.

The bottom line is that it's a big blob of a vehicle with a relatively large engine doing the work, that's not a recipe for fuel low consumption.

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