How low does the battery get before the engine kicks in on my toyota prius?

  • There's no real way to specify this. The Prius tries it's best to keep the battery state of charge (SOC) at six bars in the 2004-2009 and 3/4 full in the 2001-2003. When the SOC is lower or higher than these points the Prius will either run the engine more or use the battery more to get back to the "ideal" point. This... Read More
  • The hybrid computer has a complex algorithm (meaning it acts weird) for maintaining battery charge. The central doctrine is to keep the charge near the midpoint so there is energy to draw from and room to store more. The hybrid computer does not like to fire up the engine just to charge the battery - it would rather... Read More
  • Read the gauge and feel and/or listen, or read the owner's manual, or call and ask the dealer.

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The high-mileage fuel economy derby has one big name--the Toyota Prius--and a couple of interesting competitors. The Honda Civic Hybrid approaches the Prius's fuel economy numbers, but has a little less interior room. The Volkswagen Jetta gets a new clean-diesel option later this year, and it could have fuel economy of up to 50 mpg or more on the highway--along with a much richer interior and a more conventional sedan shape.

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