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Old 06-15-2021, 11:36 AM   #25 (permalink)
JSH
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Adventure Seeker - '04 Chevy Astro - Campervan
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Quote:
Originally Posted by Hersbird View Post
I realize the turbo while in boost is no longer in economy mode, but both trucks had similar weights pulling the same weight up the same hill, with the exact same speed and acceleration. To me that means they both required the exact same energy usage and yet one was 33% more efficient. Normally that's a gas vs diesel kind of difference with the diesel having more energy per unit along with a more energy efficient motor. Basically that EcoBoost must go rich as hell over a certain boost level.
The naturally asperated truck was more fuel efficient in one very specific use case - towing up a 8 mile long grade at a set speed. That doesn't mean the NA engine will beat a turbo in all cases or even an average use case.


There is also a lot more to this test than just the engine. Were both tow rigs running the same gearing? It is entirely possible that the speed limit on that stretch of highway puts the Ecoboost hybrid at a particularly inefficient RPM and slowing down or speeding up 5 mpg could have completely different results. Also the hybrid battery would deplete very quickly on a long steady uphill. Hybrids do better in rolling hills or stop and go.


EDIT: Found the article. Completely different gearing - 3.21 vs 3.73 rear ends. One geared to tow 7,800 lbs and the other 11,000 lbs.

Last edited by JSH; 06-15-2021 at 11:50 AM..
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