EPA ratings show that the new B5 and B6 powertrains will improve city fuel economy estimates for these models by 1–3 mpg.
Volvo is aiming to boost fuel efficiency by bringing its 48-volt hybrid system to certain U.S. models for 2022. EPA ratings for the 2022 Volvo S60, S90, XC60, and V90 Cross Country show new B5 and B6 designations with slightly higher city fuel economy ratings than the nonhybrid T5 and T6 predecessors. the S60, for instance, rises from 23 mpg city to 26 mpg city, while the V90 Cross Country goes from 20 mpg city to 22 mpg city.
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