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Originally Posted by TheBlizzard
Thats what it was, Cadillac did it for mileage didn't they, but failed?
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caddy did the displacement on demand thing in the mid 80's with the 4.1L engine, but they couldn't get the injectors completely shutoff for some reason and it would spray some gas on the cylinder walls while the piston was disabled, thus washing the cylinder wall of oil and causing premature failure.
i'm guessing the current displacement on demand engines had fixed that problem. it is quite a good idea, but is only useful to the people who drive on the highway. in town the engine is running on all cylinders all the time.
if you look at the hemi ram with the dispacement item, it gets something like 12 in town, but I think it's 29 on the highway. Might be 24 though.
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