汽车加油英语说法是 "fill up the car with gas"，其来源是由于汽车需要燃油来提供能量。例如：

I need to fill up the car with gas before I go on a road trip. (我在开车旅行之前需要把汽车加满油。)

Can you stop at the gas station and fill up the car? (你能在加油站停下来给汽车加油吗？)

I forgot to fill up the car and now I'm stranded on the side of the road. (我忘了给汽车加油，现在我被困在路边了。)

希望我的回答能帮到您。