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    I am not happy with the fuel economy in my 2021 Isuzu MU-X

    Isuzu Isuzu Advice Isuzu MU-X Isuzu MU-X Advice Isuzu MU-X 2021

    My 2021 Isuzu MU-X has done 27,000km and I'm not happy with the fuel economy of 12.2 litres per 100km on highway driving. It seems this is an issue as I have spoken to other owners with similar problems. The dealer keeps telling me the vehicle needs to have 30,000km-plus on the clock before the economy improves. Is this right?

    Answered by CarsGuide
    5 February 2024
    David Morley

    It's true that new engines can be 'tight' and this can lead to higher fuel consumption than they achieve with a few more miles on board. And since you're almost at the 30,000km mark now, why not try the dealer's advice and see if things start to improve.

    The MU-X was never the most fuel efficient vehicle in its class, but even so, 12.2 litres per 100km on the highway sounds a little excessive (although not as much as you might think). I'd expect this vehicle to return highway fuel economy figures closer to 10 litres per 100km or maybe a bit less.

    However, there are several factors that might be skewing your results. The bluff aerodynamics of a vehicle like the MU-X mean that even a slight headwind can increase consumption. So can the addition of accessories such as a bull-bar and roof racks. A set of roof racks on their own can add a litre of fuel to every 100km travelled, and that's if they're not loaded. Throw a spare tyre and some gear up there and it's even worse.

    Bigger (taller) tyres can also increase fuel consumption, and so can running your tyres at too low a pressure.

    Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.
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