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Compression ratio
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===Motorsport engines=== [[Motorsport]] engines often run on high-octane petrol and can therefore use higher compression ratios. For example, motorcycle racing engines can use compression ratios as high as 14.7:1, and it is common to find motorcycles with compression ratios above 12.0:1 designed for 95 or higher octane fuel. Ethanol and methanol can take significantly higher compression ratios than gasoline. Racing engines burning [[methanol]] and [[ethanol fuel]] often have a compression ratio of 14:1 to 16:1.
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