Unfortunately, there are not many cars in the Rs 30-40 lakh range anymore, as the executive sedan segment has gone extinct, and most premium and luxury SUVs start closer to Rs 50 lakh. There is one good option for you in the form of the Jeep Meridian. It's a premium SUV with a luxurious interior and a strong diesel engine with a smooth automatic gearbox. It works great out on the highway, with good stability and comfort, and while not outright fun to drive, it has a strong engine and sorted dynamics. You even get the option of five or seven-seat layouts for the interior.