Questions of fuel intake reduction have obtained big actuality in conditions of energy crisis and development of more strict demands to the exhaust emissions. Chip-tuning carries out power increase, but what about tuning for fuel saving? The name for this type of performance improvement is eco-tuning. Additional torque in low frequency of rotation range provides an ability to switch up earlier. As a result, one can achieve some economy of fuel, if the style of driving remains constant. According to RS-chiptuning surveys, up to approximately a liter per one hundred kilometers is saved. However, this reviews concern vehicles with engines of big volume. In a case of midget cars or diesel cars results may deviate from aforementioned surveys, because chip-tuning is mostly oriented to power increase than to economy of fuel.