The Focus concedes a few m.p.g. - its highway mileage is in the mid-30s - but it offers more passenger room and 20 extra horsepower.

Four of the Hemi's cylinders shut down at cruising speed, improving highway mileage considerably.

Legislation on automobile fuel efficiency, for example, often delegates the development of the actual engine tests used to calculate 'city mileage' and 'highway mileage'.

Indeed, the additional sixth and seventh gears improved highway mileage by 10 pecent, Mercedes says.

This one cuts the estimate of highway mileage another 8 percent, on average, and city mileage up to another 25 percent beyond the 1984 cut.

Diesel will do maybe twenty-five to the gallon, highway mileage.

This smaller engine is the primary reason cars equipped with IMA get better highway mileage than their more conventional counterparts.

Nearly 60 percent of the city's highway mileage is in the program.

The three-speed automatic added a lock-up torque converter to aid highway mileage.

This contributes to the better city mileage than highway mileage.