MinI One Auto...Poor MPG,,,new plugs?

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Bought the Mrs a 2004 Mini one auto. Car has been well looked after and covered 24k. A full tank seems to yield around 230-240 miles which is surely very poor. Admittedly its used for short journeys but you'd expect it to be better than this? I can't find a receipt for new plugs in the history file though it's been for plenty of services over 11 years.

Would new plugs make much difference?

Other than that it seems the idle is quite fast at just under 1k though it shows up as normal when on BMW diagnostic laptop. Any ideas PH?

[highway]

It's a 5 speed cvt box.'I think that level of economy from what it ultimately far from a fast car, is really poor. Seems at for the course though based on what I'm reading here. When did mini ditch Chrysler engines? She wants a cab and I want better mpg

[highway]

Just brimmed it earlier.'it managed 248 miles from last full tank. I just put 47 litres in. Amazed it's so poor. I would have expected low 30's even around town.