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Originally Posted by JohnnyGrey
So the turbo engine not only has to overcome the MPG numbers of its N/A counterpart, but it has to do so by a margin that justifies its more expensive fuel.
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Not every turbo engine needs high octane fuel (Miller-cycle).
Not every down-sized turbo engine needs to run high octane fuel all the time. If you read the whole post, MIT developed a dual injection system that uses pure ethanol during acceleration and 87 during cruise.
You are definately right that through conventional modes of thought and technology, downsizing and taking the hit of premium is the only choice. If you look at industry and automotive research firms, you'll see some are willing to think outside the box.
The conservative big three are the ones I've seen really pushing down-sized turbo-diesels and gas engines. It took Mazda to bring us the wankel and the miller-cycle. It took Honda to bring America the hybrid. It took Toyota to bring us the parallel hybrid. It took GM to do nothing.
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Originally Posted by Duffman
...because the shapes are enhanced FE certainly cant go down so what is the problem? If FE goes up in hilly regions and doesnt go down on the flats then it must go up depending on how often you can use the extra power.
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Great observation. I hadn't considered that.
- LostCause