Ok, for the guys getting less mileage .. what i did was took a can of Carburettor cleaner and sprayed it in the MAF venturi on the sensors cleaning the dirt, and spray whilst the engine runs, it will try to cut out but keep hands on throttle to rev it as it dies, .... when using carb cleaner fit the long spout tube that comes with it as this way you direct it where you want!! I did this and noticed a big difference.. i.e. quicker throttle response and a faster car which means it will burn petrol and air nicely, idle is noticely better, it may idle faster but need to turn down... I have a full janspeed 4 branch system including a janspeed de-cat all the way back including an almera 1.6 airbox with K&N filter e.t.c on a 1.3 so you can imagine the amount of petrol will shoot thru the engine but driving sensibly you do notice ecnomical sides of the micra..... eventualy im gonna change my MAF for a new one to see if anything better comes out regarding the mileage to gallon... also as petrol is expensive you will getless for the money so you dont see much in the tank and before you know it your in the station again, not forgetting how much the petrol is watered down enough that it will run the car sufficiently with all the #### additives they put in it which isnt needed..
j