Lately my car(95 WRX) is using loads of fuel about 170miles full tank, also idles crap ive had to turn the icv right up(so it dosent stall when stopping at junctions)and it doesnt seem to as powerfull as it was.(its using an apexi fc mapped by 1 of the best so id like this to be ruled out) I have regaped my plugs .6, cleaned icv, fitted new uprated fuel pump and checked vac pipes which dont appear to be split and cleaned MAF. Any help on causes or what i could check next would be a great help cheers.