Posted by 320B on March 08, 2014 at 13:17:22 from (70.26.74.24):
In Reply to: fuel economy posted by greg oliver on March 08, 2014 at 10:00:35:
I agree with everybody, it doesn't make sense. My 97 dodge ram 3500 4x4 club cab diesel dually weighing 7000 pounds gets 23 mpg highway at 70 mph. Stock it had 180 hp, it now has 268hp and no emissions crap. I adjusted it a bit in the driveway. Gotta love Cummins 12 valves.
My 06 f350 4x4 crew cab diesel dually weighing 9000 pounds got at best 16 mpg at 50 mph. It came stock with 325 hp and all kinds of emissions crap and related issues and is still stock and broken down in the driveway and has been for over a year.
Some of the reasons are obvious, the ford weighs 9000 pounds. The cummins has a lot more torque than the ford. As they improved on efficiency they increased hp and added more junk to help burn unburned fuel. If I launch the dodge hard it let's out a puff of black smoke, if I launched the ford hard it didn't produce any smoke until the emissions system started to fail.
If you keep burning your exhaust until it's clean your truck is not going to have much power so I guess they figure if they add more fuel your hp will come back. I don't know.
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