Since your usage is around 1,000km per month and mostly in the city, a diesel engine is not essential, but it certainly would lower your daily running costs. However, these days and in this segment, the purchase price tends to be much higher than a petrol equivalent. As such, the best car for your needs is the new Hyundai Venue diesel AT, but it will be much pricier at almost ₹19 lakh, on-road, in Trivandrum. As the newest of the compact SUVs, it does have the latest tech, a great interior, and a good engine/gearbox combination.