* Hybrids are a spectrum: "Hybrid" covers a wide range of cars, from mild hybrids that primarily rely on gasoline to plug-in hybrids (PHEVs) with larger batteries that can go longer on electric power.
* Battery size matters: The size of the battery is a major factor. A PHEV with a large battery might go 30-50 miles on electric power alone, while a mild hybrid might only go a few miles before switching to gasoline.
* Driving conditions influence range: Driving style, speed, weather, and terrain all affect how far a car can go on electric power.
Instead of an average, here's a better way to think about it:
* Focus on the electric range: Look at the manufacturer's stated electric-only range for a specific hybrid car.
* Consider the overall fuel efficiency: Hybrids generally offer better overall fuel economy than gasoline-only cars, even when the battery is depleted.
If you're interested in a specific hybrid model, check the manufacturer's website or a reputable automotive review site for detailed information on its electric range and fuel efficiency.