Audi has just released details on their new 1.8 TFSI engine, and it makes some impressive gains in fuel efficiency. The gain over the outgoing TFSI is 21%, an impressive figure considering the old engine was hardly wasteful. This new engine produces 170hp and 236lb-ft of torque. Audi says that, placed in an A5, the car will be able to get 41.27mpg. CO2 emissions are also low enough that the 1.8 already meets the 2015 Euro 6 emissions regulations.

They accomplish this through the rather creative use of both direct and indirect fuel injection. Direct injection is utilized at higher engine loads, and then the old-fashioned method of injecting fuel into the intake runners is employed at lighter loads. The engine also has a highly sophisticated coolant regulation system, and the piston skirts and balance shafts have received a special friction-reducing coating. The performance figures might not be the most impressive, but getting fuel economy figures like these without the use of diesel or hybrid technology certainly is impressive.