The Surbo gives more energy, enabling quick acceleration towards the more economical higher gears in a shorter time. If driving on highways, the vehicle easily exceeds speed limits due to the higher torque, so there will be more rolling and thus exceptional fuel savings. In the city, there is the same extra rolling momentum due to quicker acceleration, but much of that can be lost to braking. Thus, fuel savings can range from minimum zero (during hard sprinting in the city) to over twenty percent on the highway. Most customers report an overall improvement of 10% in economy. The following cars have been made more frugal with Surbo: