my suggestion is buy a cuore, not alto, some one mentioned that it has some good brakes, A/C ,body and chasis, i rather disagree, the body and chasis lacks the strength and brakes are pathetic, the disc and shoes always wears down after some usage. A/C is better, thats for sure, milage at patrol is around 9-10 km/Litre, On CNG, the milage is better, Remember it has an F10 engine ( a Potohar one).
Coure is smaller in size but has better grip and brakes, the milage is quite better on patrol as well as CNG. it usually gives around 16 km on A/C outside the City,
overall it is better than alto.