Suzuki Ignis 2004 Problems

FUEL consumption depends on many things, the way you drive, the type of traffic you drive in, the pressures of the tyres. So car companies use a standard test to measure fuel consumption. That way they can compare one model with the next, one make with another. It doesn't necessarily relate to real-world fuel consumption, though I would expect it will be reasonably close. If Suzuki is claiming 9.5L/100km, your 10L/100km is close enough to say you don't really have a complaint.