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Gen 6 will more than make up the usual Prius generational progress in fuel efficiency that did not come with Gen 5.

The all-new 1.5-L naturally aspirated engine that will power Gen 6 Prius will result in a 30% increase in both thermal efficiency and horsepower, increasing the 41% thermal efficiency of the current engine to 53%.

This will bring the EPA fuel efficiency to around 75 mpg. Hypermilers will easily average around 100 mpg. In populated states like California, driving a Gen 6 Prius will be cheaper than driving a BEV.

The smaller size of the engine will also allow Gen 6 to have a more aggressive design than Gen 5, with a lowered roof.

The pictures in the gallery show the new engine in a yellow Gen 5 Prius Prime.



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Toyota hints at its latest plans for upcoming ICE vehicles

Smaller, lighter, multi-fuel versions, battery assisted.

2025 Porsche 911 Sneak Preview: New 992.2 dawns with T-Hybrid, crazy aero for GTS - Autoblog

Small battery, adds 50 HP, sub 3 second 0 to 60. No EPA yet. No convertible or Targa yet. Adds $15k from previous model.

Review: improves drive-ability per test driver with reviewer ride along.