Using 93 octane in my insight
gives me more power during lean-burn.
That results in higher MPG.
.............because I can avoid using rich-burn when climbing gentle slopes (I left out that key piece).
Quote:
Originally Posted by livvie
Toyota Prius hybrid electric (front-wheel drive) with a compression ratio of 13.0:1
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That's the compression-to-expansion ratio. Prius has an abnormally large expansion, but the same compression as any other car, so there won't be any pre-ignition of the fuel even with 85 octane.