Fuel Prices Rise Slightly Jul 21, 2023 | 8:47 AM PEI fuel prices are up slightly. Gas prices stayed the same, as announced by IRAC, with the minimum price at 1.76 a litre. Diesel goes up 2.3 cents and is 1.78 per litre. Furnace oil also goes up by 2.1 cents or 1.34 a litre.