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Why are diesel engines more efficient than gasoline engines?

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Diesel engines can be up to 30 percent more efficient than their gasoline-burning counterparts. Here's why compression-ignition is thriftier. read more

In fact vehicles powered by compression-ignition engines are often dramatically more fuel efficient than their gasoline counterparts. In fact they can be up to 30 percent thriftier, which is HUGE. Take a look at the 2015 Audi A8 L for instance. With a 3.0-liter supercharged gasoline V6 under the hood its combined fuel-economy rating is 22 MPG. read more

Diesel engines are efficient than gasoline engines because of high thermal efficiency (diesel engines have 50–60% whereas gasoline engines have 30–40%), higher compression ratios (diesel engines have 14–22 whereas gasoline engines have 6–12), diesel burns in the exhaust stroke also which gives more power and torque as comapred to gasoline engines, less diesel is required as compared to gasoline to ignite the mixture. read more

Even though they are more efficient, there are eight historical problems that have held diesel engines back: Diesel engines, because they have much higher compression ratios (20: 1 for a typical diesel vs. 8: 1 for a typical gasoline engine), tend to be heavier than an equivalent gasoline engine. read more

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