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Why is the fuel consumption of my 2019 Isuzu MU-X getting worse?

Asked by John

I've had the Isuzu MU-X 2019 auto for about 8 months and 9000km now, and the fuel consumption has got even worse since new. It’s now at 11.7 litres per 100km. That’s far from the official worse case of somewhere in the 9's. I live in the country and do 90 per cent high speed driving and no towing. Any thoughts?

Answered by CarsGuide

27 Jun 2020 David Morley

My initial thought is that 11 or 12 litres per 100km for an overall average is about what I would have expected. These are not small cars, they’re not light and they have fairly ordinary aerodynamics.

What you need to keep in mind is that the official fuel consumption figure is a number achieved on a very specific test cycle that in no way approximates a real-world experience. Car makers go to great lengths to nail a good number on these tests (for marketing purposes) often at the expense of real-world fuel economy. Yes, it does seem crazy, doesn’t it?

You also mentioned you use your car mostly for high-speed driving. What’s your definition of high speed? Thanks to the aerodynamics of vehicles like the MU-X an extra 10km/h at freeway speeds can have a huge effect on economy. Even removing a roof-rack when you’re not using it can save a litre per 100km.

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