Guys the numbers are conflicting here but look promising. Skyactiv X is targeting "27% better thermal efficiency"... Don't quote me on this but isn't their current engine around 36.5% thermal efficient. Thats a boost to 46.4% thermal efficiency which agrees with whats currently possible with ICE on the cheapest energy currently available to run a car aka 87 octane.
Imagine a 2016 Mazda 3 gets 33 mpg combined that could result in 42 mpg combined and 51 highway. I'd also assumme if they're going to these lengths to bust EV and Hybrid balls they will probably drop the cd down to at least 0.23. Seems neat in 2800 pound car.
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https://pdfs.semanticscholar.org/226...3adda2e15f.pdf)
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Mazda Skyactiv-3 Engine to achieve 56% thermal efficiency)
Think of the hypermiling for the love of god. lol