Info from Pickuptruck.com
Gas Versus Diesel Comparison By Brand - 7% Grade with Trailer
This page is an opportunity to compare the relative performance of the single rear wheel gas pickups against their dual rear wheel diesel counterparts on the 7% grade.
Obviously, not an apples to apples comparison (primarily because of weight and rear axle and rear track differences between the 3/4-ton and 1-tons), but it provides some indication of the scenarios where each type of engine excels. You can see the patterns from manufacturer to manufacturer are almost identical, regardless of the truck / engine / transmission combinations.
Again, as we noted during the level 1/4-miles at Milan and MPG, look at how close the time and speed curves are for the Ford trucks. They were near identical up the 7% grade. In contrast to the Dodge and GM oil burners, the 6.8-liter V10 gas engine was faster moving up the grade than the 6.4-liter V8 diesel.
We'll raise the question again - with performance numbers like these, if you're not going to hold onto your Power Stroke for more than 100,000-miles do you really need to pay a $6,000+ premium for the diesel option over the gas V10 Triton's power and capability?
Pickuptruck.com has all the graphs showing on 7% diesel grade pulls with 10500 pound trailers, GMC was first, Dodge was second, and Ford's 6.4 was the slowest diesel.
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