Engine of Choice: Gas or Diesel

Gas or diesel engine? Is there really such a big difference between the two? For newbies, the difference probably won’t even be that noticeable. For those more experienced with cars however, the difference will definitely be evident.

Gas vs. Diesel – What’s your verdict?

Go the distance

For long distance driving or even just driving across the highway, it’s always diesel engine that has become the weapon of choice because of its higher compression ratio and more efficient combustion system that gas engines cannot match. One can’t also discard the fact that diesel is cheaper than gas; and with today’s ever increasing price of fuel, practicality plays a big key for the choice of engine.

The average thermodynamic efficiency (the amount of work the engine produces from the fuel) of diesel engine is 15% percent higher than gas engines. Sure, the diesel engine is less environmental friendly than gas engine but the efficiency gains of the engine itself is much more distinguishable for these engines.

Don’t dismiss gas engines just yet

But just when you think choosing the diesel engine is a no-brainer choice, think again. With the help of technology, the efficiency difference between gas and diesel engine is now shrinking. Improvements in engine parts such as camshaft timing, direct fuel injection, and turbo chargers have helped made the gas engine become more efficient.

Research today are pitting the gas engine to become more efficient than diesel engine by 10% in the next 10 years. With the way technology is advancing, gas engine could overtake diesel engine in terms of efficiency soon – this is great news, not only for the market but for the environment as well.

But then again, don’t expect diesel engine manufacturers to just do nothing. The constant rise in technology will do good for the future of diesel engines. And besides, they already have a current advantage of gasoline engines with the fact that t diesel fuels contains 14% more energy by volume. With oil in the world starting to become scarce, it’s really a matter of who has the better research on efficiency.

About DJ

Part-time technology consultant, part-time blogger -- I let the blogs do the show and tell


  1. well now you have urea injection that improves efficiency. the whole problem is that the they stick so many emissions parts on the engines that they can’t run to their true potential for example the egr (exhaust gas recirculation). This causes the unburnt fuel going throu the exhaust to go back in lowering efficiency. The big three all starve their engines from true potential for example the 6.4L powerstroke engine with just a tune can achieve 600rwhp from the stock 350. All diesel’s need is more air and they can burn more completely. I also heard another story of the 6.4 with just a tune, egr delete, and different exhaust went from 8mpg to 23mpg. I have a 7.3 powerstroke or a T444E diesel and all i installed was a chip and a aftermarket air intake an achieved an upwards of 6-7 mpg difference. Also if you ever get a chance to pick up a copy of Diesel Power magazine they go through everything, i’ve seen multiple people that have trucks that have over 1000hp and get between 20-40mpg can a gas do that????? If the day ever happens that it does we will probably have run out of oil in the world and will be resorting to no other than BIODIESEL..

  2. CRDi engines produce cleaner exhaust. 🙂

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