Well, there is another option but it unfortunately causes arguments because a lot of people are hung up on half century old propaganda from the oil industry and love making impossible perfection the enemy of achievable better
You can burn oxygenated fuel, aka alcohol.
The difference between petroleum and alcohol inside the combustion chamber is that a petroleum molecule is a bunch of carbon and hydrogen atoms while an alcohol molecule is carbon, hydrogen and oxygen. Oxygen atoms take up space and have mass - quite a lot more mass than hydrogen - so that is why a gallon of alcohol has fewer BTU's than a gallon of petroleum.
But that oxygen is available to combustion and it got into the engine without having to pass through the air filter, past the intake valves... and it didn't bring a huge amount of inert nitrogen into the cylinder with it, and it doesn't need to expend BTU's heating up inert nitrogen, and it doesn't have to push all that extra inert nitrogen out of the tailpipe with it.
A gallon of E85 is chemically almost identical to 3 quarts of gasoline plus 1 quart of liquid oxygen. Usually you get the oxygen for free out of the atmosphere - and you still need some more of that free atmospheric oxygen to make combustion possible - but now you're supplying some of it in the fuel itself. That's why the stoichiometric ratio for E85 is a smaller spread than for straight petroleum.
The math here is easy. At some arbitrary RPM like for example 4000 RPM, wide open throttle, estimated 79% VE* you'll be able to draw in about 315 cubic feet of air per minute naturally aspirated.
A cubic foot of air is about .0807 pounds, so 315 cubic feet of air weighs about 25.42 pounds.
At a 14.7:1 stoichiometric ratio for pure gasoline when you burn 25.42lb of air you burn 1.729 pounds of fuel. 1 gallon of petroleum gasoline has 114,000 BTU's, 1 gallon weighs 6.3 lbs, 1 pound of gasoline has 18,095 BTU's, 1.729 pounds of gasoline has 31,287 BTU's.
That means at 4000 RPM your 5.7L naturally aspirated Hemi burning pure petroleum gasoline is releasing 31287 BTU's of energy from the fuel it's consuming.
E85 has a lower stoichiometric ratio - 9.7:1 . Your air VE doesn't change so you can still draw in the same 25.42lb of air at 4000 rpm but now you're able to burn 2.62 pounds of fuel. 1 gallon of E85 has 81,800 BTU's, 1 gallon of E81 weighs 6.59 lbs, 1 lb of E85 has 12,413 BTU's, 2.62 pounds of E85 has 32,521 BTU's.
That means at 4000 RPM your 5.7L naturally aspirated Hemi burning E85 is releasing 32521 BTU's of energy from the fuel it's consuming, or about a 4% increase in power from a fuel with "less energy". Plus you get even more power from those BTU's because remember you're not increasing the amount of inert nitrogen you have to drag into the engine, heat up, and push out the tailpipe - so that 4% is free from the "VE tax" . Now you know why dragsters burn alcohol.
*(found the estimated Hemi VE @ 4k by googling for this engine, we'll use the same factors for both fuels so its accuracy isn't crucial for the calculation) 
