I get about 10 litres per 100kms in my car as long as it isn't short trips. I was driving more highway and about 40 kilometers to work and was getting around 400 kms on half a tank, that's about 40 litres. Half a tank is around 10 gallons and 400 kms is about 250 miles so about 25 mpg. If I drive more on the highway it goes up to about 30mpgs. I using synthetic oil and a K&N filter so that might be why I'm on the high side. The fuel ecopnomy did improve with the synthetic oil and the filter. Most people on the K&N website atate about 2mpg improvement in fuel economy. The synthetic let me go about another 50 to 100 kms on a tank so 30 to 60 miless better per tank. I really recommend using Mobil 1 synthetic as the cars runs so smooth and is really quiet.