Prices of gasoline expected to peak at about $4.31 a gallon, while its much higher for diesel that powers trucks on the road at $5.80 in April 2026, according to Energy Information Administration. Diesel is produced mostly in Persian Gulf as the oil in the US is mostly suited for making gasoline and Gulf oil better suited for making diesel. Supplies were tight before Iran War already, while gasoline supplies are not tight. This is why diesel (and jet fuel) costs a lot more than gasoline in 2026.