Malaysia is facing renewed pressure to expand palm-based biodiesel as the Iran war drives up fuel costs, but industry and academic observers say high infrastructure costs and slow roll-out make it an unlikely source of quick relief.That tension has sharpened as the government confronts a swelling fuel subsidy bill and greater exposure to imported supply shocks.The finance ministry last month said petrol and diesel subsidies could reach 4 billion ringgit (US$903 million) a month with crude oil...