![]() You can copy and paste this link to share: SHARE THIS ARTICLE: Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. For a comprehensive guide on this entire subject you can visit this link: LEARN MORE ABOUT THIS BOOK HERE This Tech Tip is From the Full Book, PERFORMANCE AUTOMOTIVE ENGINE MATH. Higher compression ratios are the main reason diesel engines consistently produce better fuel economy than gasoline engines. ![]() Once the OEMs gained greater control over fuel and spark with EFI and electronic engine management, compression ratios shot up again because automakers know it makes more power and yields higher fuel efficiency. Everyone remembers the anemic low-compression 1970s and nobody wants to repeat them. Higher compression ratios yield more power in racing engines and street engines. You never see a low-compression racing engine unless it is arbitrarily limited by some class restriction. An engine’s compression ratio is a big deal.
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