MPG and running costs
The move towards turbocharging has made BMW’s M-car coupe a much more frugal car. The old M3 coupe was a serious commitment when it came to fuel costs, but now, finally the M4 is far more manageable.
BMW promises 34mpg, but in reality mid-20s is much more likely on a motorway cruise. Perhaps more crucial is that pushing on in the M4 doesn't completely cripple the average fuel consumption figure.
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As for running costs, tyres are obviously expensive and given the way that the M4 delivers its torque, you will get through them. The Pilot Super Sports fitted to the car cost around £1000 a set, which is important to consider, especially if you're planning track days.
It's important to remember with the M4 that it needs a running in service at 1200 miles. Also worth noting is that the M4's launch control system is usually activated at this service so you can use it.
Servicing costs after that depend on the package you have setup with BMW. Parts will not be cheap as it's an M-division car so most consumables carry a premium over a standard 4-series.