The Honda Insight is a hybrid electric vehicle that was manufactured and marketed by Honda. In its third generation, it became a four-door sedan. It was Honda's first model with Integrated Motor Assist system and the most fuel efficient gasoline-powered car available in the U.S. without plug-in capability - for the length of its production run. The third generation Honda Insight prototype debuted at the 2018 North American International Auto Show, and the production version was unveiled at the 2018 New York International Auto Show. It is based on the tenth-generation Honda Civic sedan, and shares similar exterior and interior dimensions. Unlike the previous Insight, it is a traditional sedan, not a five-door liftback. The new Insight utilises Honda's third generation two-motor hybrid powertrain, featuring a 1.5-liter gasoline engine that runs on Atkinson cycle combined with an electric motor and a lithium-ion battery pack. The Insight shares the same trunk space as the tenth-generation Honda Civic Sedan, as the batteries for the Insight do not impede on trunk space. The fully digital LCD instrument cluster was taken from the larger 2018 Honda Accord, and many interior styling features were taken from the tenth-generation Honda Civic Sedan, which is assembled at the same Greensburg, Indiana plant as the all-new Insight. Honda projects a 55 MPG city, 49 MPG highway fuel economy, and 52 MPG combined rating for the 2019 Insight LX and EX trim levels, as compared to the 51/45/48 MPG fuel economy ratings on the Touring trim level. The difference in fuel economy between the versions is due to the higher weight and added equipment of the Touring version. The third generation Honda Insight went on sale at Honda dealerships in the United States in June 2018 as an early 2019 model year vehicle. It was also launched in Japan on December 13, 2018 and went on sale on the next day.