Hmmm, driving in a chilled manner woulda been my first suggestion but you're already doing that. Yes an induction kit will increase fuel consumption. Sometimes remaps increase how economically a car runs, making sure the tyre pressures and ting are all at the right level would help a smidge, not sure what else you could do to conserve fuel apart from not driving
Sorry I can't be more help!
Tom
Have you ever drunk baileys out of a shoe
Hunter S Thompson RIP
Seriously though, what's your MPG working out at? There's lots of advice to be found on "frugal driving". Get to the speed you wish to go as quickly as possible, slow down in advance of junctions to lessen the braking, switch off at red lights etc.
200 miles to a tank is about 25 MPG. Which is low but I would only expect to see that sort of figure if you were driving it with a slightly heavy right foot, which you say you are not.
I've had 2 Works and they both return, almost to the mile, about 240 to the tank which is about 30 MPG. I like to drive it swiftly when the urge takes me, but I do tend to go with the flow a lot more now.
Also depends what sort of roads you driving on, town driving, 'A' roads, motorways etc.... my daily drive is only about 8 miles down 'A' roads, where you lucky to do more that 30-40 MPH.
Computers aren't that accurate. Best way to gauge your MPG is to fill up and reset mileage, next time you fill up, write down miles covered and the fuel you have to put in to top up, reset and repeat and you'll get an accurate MPG over a number of fuel stops.
Do a roadcraft driving course and learn acceleration sense, you will find that with this method you can drive most places without using the brakes at all, especially on motorways.
Try not to stop start but use better judgement at junctions and in moving traffic.
You can buy the roadcraft book from normal bookshops.
I get between 280 - 320 miles per tank but that is not going over 3500 rpm other than on the motorway.
I found my MCS gor better economy once I changed the filthy black air filter that BMW don't change at the first service.
Also I get no difference in MPG with higher octane fuel.
My Suzuki Swift does about 9mpg more than my S so you can probably guess which is my daily driver.
You can only do so much to increase mpg, keep the car well serviced, correct tyre pressures, smooth driving style etc, at the end of the day a thirsty car is a thirsty car
sorry to say if its all town driving then it will be bad news
i have a fair percentage of motorway on my daily drive, 3000rpm approx = 70mph
= 300miles + per tank, have got 360 on a long relaxed run
also got less than 250 after last cotswolds run
you might have to train your right foot,
also if you try and drive at bike speeds, even in a mini you will get a poor return per gallon
hope your still enjoying the car
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How to be economical?? 
carefree 
