Diesel engines produce more energy than like sized gasoline engines
The Four Strokes are:
Take note: combustion did not take place until fuel was injected into the (combustion) chamber where super heated compressed air waits. In this case a spark plug is not needed because the super heated air ignites the diesel fuel. Referring to the gasoline engines page on compression ratios and combustion temperatures are discussed. Diesel engines use a higher compression ratio to ignite fuel. As we've seen, this happens when the engines pistons compress the air taken in during the intake stroke. We think of air as oxygen, unfortunately (for internal combustion engines) it is contains nitrogen, carbon dioxide and trace gas elements, and its composition can be affected by pressure, elevation, and humidity. In any case, the charge density of compressed air is all of these elements bunched together under pressure. More compression means greater density. This is the realm where we deal with a diesel’s combustion, the point where the fuel is injected fuel and ignited by the hot compressed air. N (nitrogen) and CO2 (carbon dioxide), do not assist in combustion, but in effect hinder it, although the diesels higher compression ratio effectively overcomes inert gases. It should be noted here, that the biggest drawback to the diesel is its ability to make horse power. Naturally aspirated diesel engines have very slow burn rates when compared to gasoline engines. However, diesel compression ratios are from 14:1 up to 25:1 compared to 8:1 to 12:1 for gasoline engines. In effect, it is the slower burn rate that limits a diesel engines ability to produce high rpm’s. However, this can be overcome with forced induction, i.e. supercharging or turbocharging. This is basically saying that the speed at which an engine can process the fuel into combustion energy, the more horsepower it can produce. Comparing a diesel to a gasoline engine in making horsepower goes like this: the gasoline engine depends on RPM while the diesel depends on high compression. Since a turbocharged diesel supplies more air to the combustion chamber the injected fuel is more efficiently burned. On the other hand, adding a hydrogen boost to an ordinary aspirated engine has roughly the same effect as turbocharging. Adding hydrogen to a turbocharged engine boosts its ability to burn the fuel faster and more efficiently. In short, an engine can only produce as much power, in proportion to the amount of fuel it can burn. And this is governed by the amount of oxygen available in the cylinder. When a diesels volumetric efficiency (VE) is increased by forced induction, and adding a hydrogen boost, lower piston velocity is contravened. At this point, greater horsepower is achieved using 30% less fuel than spark ignition engines. See Gasoline Engines also. 
In other words, a faster burn equates to more horsepower, less fuel consumption fewer harmful emissions and quieter operation. Needless to say, incomplete combustion produces carbon monoxide (CO), along with soot (PM) being formed because of the lack of or reduced oxygen.
Hydrogen plus oxygen adds greater volatility to the bunched oxygen brought about by forced induction. As a result, much more of the fuel is burned. After all, oxygen plus hydrogen equals rocket fuel – need I say more? Links:  Custom Search
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Adding hydrogen provides an additional boost to burn times. The illustration above shows diesel fuel being injected just prior to combustion.
