Burning oil is an example of a free radical, exothermic (heat given off) reaction and entropy is involved as it is for all types of reactions. If entropy is the reason why we get so much heat would mind explaining how endothermic (heat adsorbed) reactions occur. Hint: you need to understand the 1st, 2nd and 3rd laws of thermodynamics. Yes energy is stored in oil, entropy is not the reason.

Entropy is how you get that energy OUT.

YES YES YES...they are ALL entropic. ALL sources of chemical energy create entropy as the molecules degrade and release energy.

The DIFFERENCE and the REASON why oil is MORE efficient than ANY battery is...

Drum roll...

You have to MAKE batteries out of raw materials...you NEED factories, supply chains, workers...AND...160 times MORE energy than it takes to pump a barrel of oil and burn it. The OIL IS THE RAW MATERIAL. You DON'T have to "do" anything to it before you can use it. A battery HAS to be built and the building of the battery COSTS 32 barrels of oil. PLUS...every time you recharge it...it takes MORE energy than you'll get out.

WHY do you KEEP shifting the discussion to entropy? It was a minor side statement. Are you autistic?

You suckered me in again...

Endothermic reactions involve entropy and they involve putting energy into the reaction. I'm not autistic but I know chemistry. Your lead premis is entropy only involves getting heat out of a reaction and that is incorrect. If your lead premise is wrong why should I believe the rest of it.