India's wholesale price index (WPI) inflation more than doubled to 8.3% in April, the highest in three-and-a-half years. This surge is primarily driven by significant increases in crude petroleum, natural gas, and fuel prices, exacerbated by supply shortages from the West Asia war. While consumers haven't fully felt the impact yet due to food prices and government fuel caps, the text indicates that as inflationary pressures generalize and fuel prices inevitably rise, retail inflation will sharply increase. This will severely test the central bank's inflation-targeting credentials.