Posted by jdemaris on November 05, 2009 at 15:20:33 from (67.142.130.11):
In Reply to: Re: pickup trucks?? posted by rustyfarmall on November 05, 2009 at 13:52:20:
It would be nice if it always worked that way, but it does not. Yes, a small engine has to work harder to keep up with a big one. But, when cruising, at low load, a small engine can use less gas if set up properly and running within its peak torque curve. Very easy to verify. Just check the EPA highway figures with same vehicles, same gearing, and different size engines. Also, when there is more power available, it often gets used.
By your reasoning, a 1/2 ton pickup with a 454 big block, when cruising on a flat highway at 65 MPH, could get the same fuel mileage as the same 1/2 ton truck with a smaller engine that was just adequate to maintain that speed. Rarely works that way- althought I've been hearing such claims for over 50 years. I had such a truck (with a 454), and it got a best of 13 MPG on highway cruises, but 11 was more the usual. Stuck in a 283 and got 17 MPG with it.
Put an engine in a vehicle that's so underpowered that it's laboring all the time or revving way out of its torque-curve, and it's a different story. I had a 21 foot Dodge Champion motorhome that got a best of 6 MPG with a 318 V-8. Stuck in a 383 and got 9 MPG. One of the reasons why the older Dodge 5.9 Cummins diesels got better fuel mileage than the 6.2 GMs and Ford-IH 6.9s/7.3s at the time was because it was the smallest engine and could behave like a bigger engine, when necessary - due to a lot of turbo boost and a long stroke.
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