You’d think the plug-in hybrid would be the fuel-economy champ, but you’d be wrong in this case.

Going hybrid doesn’t always mean getting the best fuel economy in all circumstances. Instinctively, it should, but engineering realities don’t always line up with our instincts. Like with the new 2020 Bentley Bentayga hybrid.

Despite the name, the Bentayga hybrid is actually a plug-in model, and as such it offers 18 zero-emission miles when the battery is charged up, according to the EPA. But, once that battery is depleted, the car’s highway fuel economy is only 21 miles per gallon.
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https://www.caranddriver.com/news/a32172987/2020-bentley-bentayga-hybrid-mpg-vs-nonhybrid/