BOMBS AWAY!
A petrol car moves by setting off a series of explosions. Petrol explosions. It explodes petrol thousands and thousands of times. So your pride-and-joy is nothing but end-to-end petrol bombs. Just a serial Molotov-cocktail on wheels.
To paraphrase Archimedes: 'Give me a place to drive and I will blow up the world.' (He actually said, after discovering the principle of the lever, 'Give me a place to stand and I will move the world,' but you get the gist.)