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The Hemi saves 1.7 oz. (50 ml) of fuel every 90 seconds during a shutdown, Ram 1500 chief engineer Mike Raymond says.
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The Chrysler engineer was answering questions about the RAM 1500's new 48 volt stop/start and e-assist system, which is now available on its newest trucks.
They call it "e-Torque", and it boosts EPA ratings:
The Hemi saves 1.7 oz. (50 ml) of fuel every 90 seconds during a shutdown, Ram 1500 chief engineer Mike Raymond says.
- 2-mpg gain (EPA city rating) in the 5.7L Hemi
- 3-mpg gain for the V-6
- 2WD trucks, the e-Torque V8 is rated at 17/23 mpg city/highway, while the V-6 achieves 20/25 mpg
- 4WD trucks 17/22 mpg for the eTorque Hemi, 19/24 mpg for the eTorque Pentastar.
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The eTorque system is on sale as an option on the Hemi V-8, but is standard on all Pentastar V-6-equipped trucks.
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Interestingly, the V6 version is liquid cooled, while the V8 version is air-cooled.
I wonder if liquid cooling explains why the city MPG benefit is greater for the V6 version. Maybe they can run the electric motor/generator at a higher load/more frequently.
Full article:
https://www.wardsauto.com/test-drive...pain-ram-gains