 A G-Lader would later be used on the larger and more technically challenging G60 engine used in the Golf and Corrado.An extremely fuel-efficient two-cylinder diesel was prototyped in the mid-1980s with a G40 supercharger to overcome its small capacity, although this did not make production.A high-fuel-efficiency model which did make production was Formel E (E for Economy), introduced in 1983.