bhai i am using stock tyres, its good for highway, its thin so it gives more mileage because rolling resistance is less. for spiti i would say u can get AT tyres ( All Terrain ) if u plan to do extreme off roading, get those tyres... normal uneven roads par even these stock tyres work fine. Jimny can easy do Leh / Spiti on stock tyres
i dont think so bro. mild hybrid has 2 batteries. this one just has stop start feature which uses the primary battery. there is no regeneration of energy to store in a seperate battery like XL6 or ciaz