Make Tata Safari lighter

I have a safari TCIC. I was about to sell it. He even received a foretaste of it. However, the buyer, as I personally was having second thoughts about him. The vehicle is already in much better condition than before you bought it. Now I long to hold on to it. The parts are very cheap and are fairly inexpensive to maintain, and even an old man in it. But I try to modify it to become lighter, more fuel efficient and add a bit of HP in the process.