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I'm trying to rap my brain around this so I would like a little clarification.
MechEngVT: your saying that if I put a 1.6TD and a 1.9TD in the same car, and geared them to travel at 55 mph at there best specific consumption. Even though the specific consumption for the 1.6TD @ 1800 rpms is 265g/kwh, and the 1.9TDI's specific consumption is 204g/kwh @ 1700 rpms, that the 1.9 might get worst fuel efficiency than the 1.6.
tasdrouille: Thanks for clearing that up for people posting on this thread, I guess I should have said something about that earlier, and actually thats kinda the point I'm trying to get across. Each engine design (even engines in the same class) have inherent efficiency differences, and If you were going to choose a engine for a fuel efficient ICE car, you would want to choose the engine that both fits your needs and is the most effiecent.
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