Removing unnecessary items from your vehicle can reduce its weight, leading to improved fuel efficiency. Extra weight places a strain on your engine, causing it to work harder and consume more fuel.
While this isn't going to make the biggest difference to your mpg figures it stands to reason that the heavier a vehicle is, the more fuel it will use. For that reason, don't keep unnecessary items in your boot as they all add weight to your vehicle, which is not going to help your fuel economy in the long run.
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