ShinerBock wrote:
They do. The Ecodiesel makes about the same(if not more) horsepower and more torque than the diesels in 1997 and gets upper 20s mpg. While the diesels with same displacement grew in power to more than double of what they used to back then.
This goes back to what I stated earlier. As technology allows a big liter 6.6/6.7L diesels to gain more energy out of a drop of fuel, its power will increase along with a moderate increase in efficiency. If you want to keep the power the same while having a greater increase in fuel economy, then you would have to go to a smaller displacement engine as fuel efficiency technology improves(i.e. the more energy you are able to get out of a drop of fuel).
I was going to say, I think this is the exact approach Walmart took when they designed their "Supertruck" project. The thing gets roughly 10mpg while towing a fully loaded trailer according to the rags I read about it. Uses a smaller ISX12 versus the typical ISX15 (along with numerous other tech, but they down sized the engine).
