The Surbo gives more energy, enabling quick acceleration towards the more economical higher gears in a shorter time. Most customers report an overall improvement of 10% in economy. If driving on highways, the vehicle easily exceeds speed limits due to the higher torque, so less of the accelerator needs to be pressed. For automatic cars, rolling distance is longer with foot off accelerator, with engine rpm hardly dropping due to the Surbo system's air accumulation. The following cars have been made more frugal with Surbo: