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Attached is the Mazda3/Miata 2.0 NA Skyactiv BSFC with the 13:1 compression heads. I recently bought a new standard 2.0 and without any special hypermiling tactics I can easily score 41-43mpg on the freeway @70mph and the engine is still not even broken in yet. At 100kph or 62mph, car cruises at 2200 rpm which is right at it's bsfc sweetspot. Scangauge indicates 40-50% load at cruising which pretty much means ~36% BTE...mostly thanks to it's very wide ratio VVT system which retards CAM timing up to -70* at low engine loads (artificially reducing displacement).
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