A Subaru driver boosted her car's efficiency from 24 mpg to 30 after making a single change: she stopped passing other cars

Hypermiling is back in style, amid soaring gas prices. It can boost your car’s fuel efficiency. But at what cost?

A Subaru driver hit 30 mpg — up from 24 — after making one change to how she drives: she stopped bypassing other drivers

Hypermiling is back in style, amid soaring gas prices. It can boost your car’s fuel efficiency. But at what cost?