While the study shows that there are huge gains to be made (~25%). I'm more interested in how we can use this to develop a cheap DIY solution. Is there even a way to do this? I don't know. It does seem like a fair amount of complication. And, as you cut corners you'll definitely loose efficiency. But, starting with a 25% increase is not a bad place to start.
Also, remember they started with Prius which is innately more efficient than most gas engines. Larger gains may be had from conventional engines.
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