2011 Toyota Prius – Click above for high-res image gallery

In early April, at the SAE 2011 High Efficiency IC Engines Symposium in Detroit, MI, Toyota's Koichi Nakata declared that the Japanese automaker is exploring ways to further reduce the fuel consumption of its upcoming hybrid models. According to Nakata, Toyota aims to develop a gasoline engine that operates at more than 45 percent thermal efficiency for use in future hybrid vehicles.

To put that number into perspective, the engine in the first- and second-generation Toyota Prius had a thermal efficiency of approximately 37 percent and the 1.8-liter mill in the third-gen Prius boasts a thermal efficiency of 38 percent.

Toyota is focusing on two concepts to reach its thermal efficiency goal. Concept 1 is a cooled EGR stoichiometric spark-ignited direct-injection engine that features a long stroke design. The long-stroke setup, according to Toyota, reduces heat loss, increases piston speed and creates more chamber turbulence, which improves combustion. Concept 2 is a turbocharged, lean-burning engine that incorporates the same basic design of Concept 1.

So far, Nakata claims that the engine development team has achieved a 42.4 percent thermal efficiency with Concept 1 and 43.7 percent thermal efficiency using the turbocharged, lean-burning Concept 2 design. Does this mean that a turbo'd Prius may be coming soon?


2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius front 3/4 view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius rear 3/4 view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius front 3/4 view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius rear 3/4 view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius side view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius front view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius rear view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius front 3/4 view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius rear 3/4 view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius front 3/4 view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius rear 3/4 view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius front 3/4 view

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius headlight

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius logo

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius logo

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius wheel

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius wheel detail

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius taillight

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius badge

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius badge

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius badge

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius engine

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius engine

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius engine

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius battery

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius battery warning

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius battery

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius engine

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius engine

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius engine

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius interior

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius interior

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius steering wheel

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius front seats

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius front seats

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius steering wheel

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius steering wheel controls

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius steering wheel controls

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius power button

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius center console

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius instrument panel

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius instrument panel

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius navigation system

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius navigation system

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius audio system

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius setup

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius information

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius energy monitor

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius energy monitor

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius gear selector

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius instrument panel

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius gear selector

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius gear selector

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius gear selector

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius drive modes

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius drive modes

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius seat heaters

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius door trim

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius rear seats

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius rear cargo area

2011 Toyota Prius
  • 2011 Toyota Prius
  • 2011 Toyota Prius rear cargo area


I'm reporting this comment as:

Reported comments and users are reviewed by Autoblog staff 24 hours a day, seven days a week to determine whether they violate Community Guideline. Accounts are penalized for Community Guidelines violations and serious or repeated violations can lead to account termination.


    • 1 Second Ago
  • From Our Partners

    Share This Photo X