A gallon, I guess...
Here in Italy 1.85 a liter... Diesel and petrol are alternatively more expensive... In the latest months diesel for the first time ever was more expensive than petrol. Now petrol is again more expensive than diesel. As other people said, ordered diesel or petrol on that basis is a nonsense. Unfortunately, sentimentally approved laws and rules are more influent on the decisions. After years of pumping diesel engines, Diesel gate and the media, relocate diesel engines in a dark area... By the way, I hope that the obsession with electric motors will be overcome by a more reasonable technological neutrality. Synthetic fuels are significantly more environmentally friendly, full cycle, than electric motors, full cycle.