You have decided to select a new car by using the scientific method. how would you proceed? !

We look at the  criteria to select a car.

If we are not too rich, we have to bother about fuel efficiency. The mileage in terms
   of km per liter or miles per gallon etc.

engine power - whether it is good enough over a slope (steep) that I may encounter
     frequently with my family members.

internal space / total external size :  or  internal space / total price:
   We find these numbers. after all , we make use of the internal space on seats.
   we have to know its proportion in the total volume of the car.

the axle turning capability, wheel turning ability :
   see the minimum radius and span required to turn a car in a U turn.

we have to bother about its pollution, emission level.

height / width ratio, which is important for the balance of the car.


If we are looking  at the economic point of view
   monthly benefit/savings of using the car,converted into currency - Loan EMI