I just recently purchased a 94 Supra Turbo and was wondering if the gas light is suppose to turn on at a quarter tank. I had a Lexus SC300 and the gas light would not come on until i hit Empty. Is the Supra's gas tank 20 gallons? or 16 gallons? The needle was at 1/4 tank and the gas light came on so im guessing the gas tank should be 20 gallons. I just want to make sure that when the gas light is on that im not running on fumes.