According to an article published today by Autocar , the eighth generation Volkswagen Golf will feature a design based on the 313mpg XL1 and next-generation engine technology to maximize efficiency and meet strict EU CO2 emissions standards which take effect in 2020.  With the car an estimated 4 years away from its european debut, Volkswagen has already begun researching a number of fuel-saving technologies including an extremely low target weight of just 1100kg.  The aforementioned fuel savings techniques are reportedly Flywheel-based hybrid systems, new engines with variable compression ratios, 'coasting' technology for DSG transmissions with engine deactivation and transmission decoupling during off-power driving, and electric turbochargers.

Flywheel-based hybrid systems are certainly nothing new, but variable compression ratio engines are.   Earlier this year, Audi's Ulrich Hackenberg hinted that the group was working on such a technology, which can be considered by many to be the "holy grail" of combustion engine design.  We also know that Audi has been experimenting with electronically-aided forced induction , which would prove to assist in moving air through the turbocharger of a smaller displacement engine, eliminating lag and increasing drivability.  As for the 'coasting' technology, that is actually already in place on some DSG-equipped cars meaning that the technology would simply need to be refined further to maximize efficiency.

We expect to hear more about these technologies and the eighth generation Volkswagen Golf as we get closer to it's estimated arrival in 2019.