So this should have been written:
"There is a diesel engine capable of 50% but not available for vehicles."
Thanks for the clarification and information.
BTW, I was on the design and construction team using Wartsila diesels for power generation. Not this big, only 31,000 cubic inches and not from the Sulzer joint venture. My experience on that single job (not a very good sample set, I agree) was Wartsila was a lot better at making claims than delivering performance. But I do appreciate the information, thanks again.
Well, I’m not auditing their claims, just trying to point out that Diesel due to higher compressions and more BTU per gallon are generally more efficient.
I apologise if I wasn’t clear, the point was the MOST efficient gasoline engines only get to about 38% efficiency, while the most efficient diesels are around 50%.
In car engines generally its about 25% efficiency for gasoline and 40% for diesel, as I understand it.