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Steel tanks are generally heavier than aluminum tanks, though the thickness of aluminum tanks does vary. Lighter tanks tend to be more fuel efficient, since less power is required to haul them, which means that aluminum tanks tend to be more fuel efficient. Also, aluminum tanks, since they are lighter, are more easily formed and molded than steel tanks.

Steel tanks are more durable than aluminum tanks, since they are heavier and more dense. Since they are thinner, aluminum tanks corrode more easily than steel tanks, which means they are more likely to leak. However, both types of tank are susceptible to leaks from corrosion or puncture.

Steel tanks are more commonly used as gas tanks. One of the reasons why steel tanks are the more common choice is that they are cheaper than aluminum tanks and, since they last longer, they offer more value for money in terms of their durability. If cost is a major factor in deciding which tank to go choose, steel tanks may be right for you.

Steel gas tanks are generally coated with zinc or with terne, a combination lead and tin. Auto manufacturers mold them into different shapes depending on the vehicle theyre designed for. Steel tanks may be safer than plastic tanks in the event of fire because they do not sag or soften in a fire and do not create smoke when burning.

Plastic gas tanks are often the choice of auto manufacturers because they add less weight to the car, helping with gas mileage. They tend to be safer in crashes because they are seamless; they wont burst at the seams under pressure. Plastic high-density polyethylene tanks resist rupture as much as do steel tanks.

Regardless of the material of its manufacture, the most important safety factor for gas tanks is their placement. Fuel tanks placed between the rear tires provide safety in side collisions. A firewall should protect the rear seat from the fuel tank.