That means the engine produces more power and uses less fuel, while wasting less heat. (automobilemag.com)
In power generation torque is the amount of density (resistance) required to generate a certain amount of electricity using machinery that produce more power with more density and speed. (judithcurry.com)
Actually, if a car produces more power for the same amount of fuel, it will improve mileage. (mechanics.stackexchange.com)