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CARMAKERS publish fuel-economy figures based on a standard test; they're intended to be used for comparison purposes so buyers can determine which car is more fuel-efficient. Because they're taken from a dynamometer test, they don't necessarily relate to real-world fuel economy. The best thing you can do is to review all of the things that can affect fuel economy, such as driving style, speed, hilly terrain, tyre pressure and roof racks -- and make adjustments to minimise their effect. That said, the Nissan X-Trail is one that is often complained about by Carsguide readers and some have resorted to LPG to fix the problem.
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