The power steering installed in the Maruti XL6 is the same which is used in the Ertiga. The difference in the vehicles is the premium looks and features added in the XL6 for example captain seats, comfortable seats, etc.
The ARAI claimed mileage of Maruti XL6 is 19.01 Kmpl. The car has a ground clearance of 180mm which is sufficient for Indian roads. Even the lights are high focus lights that give good vision even in the dark.