If you want to drive then you need to load your car with gas since it is what needed to be able to run the engine. If he engine is not running then how could you get to where you want to be in the first place. Sure, you can easily buy some gas at the gas station, but what if there are no gas in the gas station then you would surely be frustrated. Fortunately, that rarely happens and there are lots of gas station in almost city or province that you know. And if they ever run out of gas then they would just call the company and they would have their reserve in no time.
In this game, you be the truck driver and you need to go to where the as station is located and fill it up. After that, you need to get out of the area to be able to the next level. This sounds easy, but that is not what it seems. You need to drive the truck as fast as you can till you get to the location. There are other vehicles in the area that might result to a tragedy. If your truck can't take more damage then it would simply explode.