Torsion Powered Vehicle

[eppie]

So, considering the most common fuels yield around 40-45 MJ/Kg, and an average fuel tank being around 55 liters. Or, a gallon of gas is equivalent to about 132 MJ.

Would it be possible to store around 2000-2500 MJ of energy in a lightweight serial sequence of torsion springs to replace the chemical fuel?

My instinct tells me that your problem will be the light weight part. I can't imagine a light spring being able to give enough power to drive a car.