Reset the mpg meter and run it for a while in Comfort and drive sensibly for a few days to see if it makes a difference.
In Sport mode, every time you accelerate hard you are using a lot of battery power. If this is your normal driving style, the overall average battery consumption will increase and the computer will give you a lower prediction for range as it expects you to keep thrashing it. The range prediction is merely that - a prediction.
Unless you have a problem, you should still have X KWh capacity in the battery, how many miles that covers depends on your right foot! You could start a journey with a prediction of 6 miles but drive gently and actually get 14+ of it.
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2014 i8
2002 x5 4.6is
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