Why Don't Small Turbo Engines Get Good Gas Mileage? (Real World)
Mazda's Secret To Efficient Turbos -    • Mazda's Secret To Efficient Turbo Eng...  
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In attempts to improve fuel economy, many companies are choosing to downsize and turbocharge engines. These small turbo engines tout the power of larger engines, but with much better fuel efficiency. You may notice however, your real world fuel economy may not always match up with the EPA numbers provided on the vehicle's monroney sticker.

Why is this? Well while downsized turbos do have many advantages, such as less moving parts, less weight, better packaging, lower frictional losses, and lower pumping losses, once the vehicles start to get into boost, that efficiency can be significantly lower. This video will discuss fuel enrichment and why it's necessary for high boost engines in order for them to run reliably.

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