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19bonestock88 · 03-24-2018, 10:48 PM

Manuals are more efficient than even a CVT because there is a direct coupling between engine and drive wheel. No fluid loss, TQ converter slippage, etc...

The torque converter is just a fluid coupling between engine and transmission, so there is loss there... there is also fluid pumps in any auto, which waste power and fuel...

That being said, a lower RPM does a lot for MPG... my 07 Malibu with same engine as my 04 Ion but the 4T45 automatic got better mileage on the open freeway due to a taller overdrive ratio AND a taller final drive... however it would go down into 3rd on the bigger hills, and I can stay in 5th on even 7-8% grade without losing speed

03-24-2018, 10:48 PM	#31 (permalink)
19bonestock88 Master EcoModder Join Date: Jun 2016 Location: KY Posts: 1,352 IGL - '04 Saturn Ion Team Saturn 90 day: 56.19 mpg (US) Thanks: 63 Thanked 366 Times in 269 Posts	Manuals are more efficient than even a CVT because there is a direct coupling between engine and drive wheel. No fluid loss, TQ converter slippage, etc... The torque converter is just a fluid coupling between engine and transmission, so there is loss there... there is also fluid pumps in any auto, which waste power and fuel... That being said, a lower RPM does a lot for MPG... my 07 Malibu with same engine as my 04 Ion but the 4T45 automatic got better mileage on the open freeway due to a taller overdrive ratio AND a taller final drive... however it would go down into 3rd on the bigger hills, and I can stay in 5th on even 7-8% grade without losing speed __________________ My current Ecotec project... My last Ecotec project...