Ford 6.7L 1050 ft lbs TQ at 1,600 rpm, 475 HP at 2,800 rpm

RCMAN46 wrote:
" the Duramax should have mopped the floor with the Cummins on the last supper Ike test instead of being less than a 15 second difference."

The major reason for the close times both trucks were able to run most of the hill at the speed limit set by the test. So depending on the accuracy of the speedometers used and how close to the speed limit the driver held the trucks to could easily result in a 15 second difference in an 8 mile run.

We need to load the units such they are not able to obtain the speed limit imposed to find which can make the most power up the hill. If this can not be done find a steeper or longer hill for the tests.

Not in the videos I saw in the 2017 tow test where they did all three at once.

The times were 10:28(with a red light at the end) for the 385hp rated Cummins and 10:17 for the 445hp rated Duramax. If they were able to do 60 mph most of the way up, then their time would have been closer to 8:00 since that is 60 mph in 8 miles. At 10:28 over 8 miles, the average speed would be 45.86 mph for the Cummins and at 10:17 the average speed is 46.68 mph for the Duramax. That is less than 1 mph difference yet the Duramax had 60 more peak horsepower.