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Originally Posted by Old Mechanic
I'm not sure about the Toyota Hybrid Synergy Drive configuration and whether it has similar limits.
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I'm assuming the Prius C eCVT is similar to the other Synergy drive units. Also I note that everybody except Toyota says the "C" has an Atkinson type engine. (Toyota says intelligent VVT.) The range of equivalent ratios in the eCVT is from about 4:1 down to about 0.5:1 The gearing limits are set by MG1 maximum rpm
[final drive is 3.19:1, rolling radius about 12 in. 1500 rpm cruise at 65 mph is about 0.525:1 gearing and maximum rpm pull at 30 mph is 3.6:1 gearing]
This PDF has some info. One limit on Prius economy is that the engine doesn't run below about 1500 rpm, but assuming Atkinson like torque, at 1500 rpm the "C" engine could produce about 22 hp. According to the
ecomodder MPG calculator the "C" needs about 12 hp to cruise at 60. So the engine is throttled, which lowers efficiency, but lowers output more.
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Originally Posted by Daox
In order to get the 45% increase in mileage to get 70 mpg, you'll need to reduce the Cd down to roughly .167!
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I don't think that's likely without major body work.
-mort