Basically this is applicable to all Auto Tranny cars when climbing, i dont trust the car ECU's shifting gears for me when ascending or descending. Ive had the worst and uncomfortable experience in driving auto cars up north and most loving experiences driving manual tranny civics (2005 & 2012) up north.
Alto gives the opportunity to drive the car in manual and auto, its auto mode is more responsive than and ordinary auto tranny car when ascending but at times you still need to have control yourself via its manual mode. but when ascending its always recommended to use manual mode.
Also in all your travels make sure NOT to idle car in D mode whenever you get stuck in traffic or traffice lights rather move it to Neutral.