That's true Shiner but that's a % number.
IOW's the 2500 lost 13 more HP than the ED. That 13 HP has to be accounted for in the burning of 13 HP worth of fuel.
And who knows if the fan was lockup up on the dyno? Big fans take big HP away from the engine. It's a lot easier to keep 240 HP cool instead of 370 or even almost 400 in the case of the newest HP Cummins. Another problem is the rea
Look at the chart on page 10 of this Cat study. Over a 50 HP loss on a RW pusher! That's a bunch! I know I have read dyno charts on my 06 Dmax and the fan on it will take away about 27 HP when it kicks on.
All of these things that help duty cycle on the 2500 will take away from efficiency. Lighter duty parts will help the efficiency of the 1500 big time.
At would be interesting to see the BSFC figures of both engines. Just the engines. No drive train or any of that. I know of no way to get those figures though. :M
