My Luv is also at 3100kms,wow.In city it is giving around 13-15kmpl,i did not calculated.Our LUV has touched max speed of 145 kmph by my dad between pune kolhapur ,and me around 125 kmph.The car just loves to be revved hard and harder,but rising petrol prices are giving shocks!! So back to basics.
About smell,there might be possibility that you may have left windows open,due to that some external smell was observed,or your AC might be in fresh air mode,other possibilities cannot be neglected.
Even i have ac filter when i turn on Fresh air,foul smell thrown sometimes,for me AC filter is of no use,i am lot comfortable with re circulation mode,whenever fresh air,open windows straight away.