Unfortunately, this isn't generally true. There are great hybrids like the Toyota HSD system, which do save some fuel - still about 4 liters per 100km - but a l

Unfortunately, this isn't generally true. There are great hybrids like the Toyota HSD system, which do save some fuel - still about 4 liters per 100km - but a lot of the hybrids are just for compliance and when run on their main engine, they don't save fuel, sometimes even use more as they are dragging all the electric stuff with them.