Recent severe demands to the exhaust emissions and global energy crisis have actualized the problem of fuel intake decrease. Chip-tuning provides power growth, but can it offer also fuel intake reduction? Specialists call this type of performance improvement “eco-tuning”. Its secret lays in the possibility to switch up earlier due to torque increase on the low frequency of crankshaft rotation range. Because of that, the driver can expect some reduction of fuel consumption, especially if he doesn’t change his driving habits. To make this question clear, GT Chip company has performed meticulous researches. It was established that GT Chip usage could save up to a liter of petrol per one hundred kilometers. Nevertheless, these surveys were made for automobiles with big volume engines and for diesel cars or compact cars the economy can be less significant. This fact sounds quite natural, taking into account that chip-tuning was invented to provide additional power, not additional fuel.