Turns out many Millennials just aren’t that into driving. That’s big news considering about 80 million Americans ages 16 to 34 make up the Millennial generation, also known as Generation Y. It’s our largest generation, ever so slightly bigger than the Baby Boomers, themselves about 77 million strong.

For Millennials, the numbers tell the story:

Travel less. For this age group in the last decade, the average number of vehicle miles traveled has dropped 23 percent. Adults ages 21 to 30 now drive only 14% of all miles driven, which is down 21% since 1995.

Buy less. Adults ages 21 to 34 buy just 27% of all new vehicles. That’s down from the 38% only 25 years ago—a sizable shift.

Drive less. More than a quarter of all Millennials lacked a driver’s license in 2010—a statistic which rose 5 points to 26 percent in just 10 years.

Gen Y tends to favor public transportation, bicycles, and car-sharing services like Zipcar. Contributing factors could be environmental concerns, as well as economics—it’s expensive to own a car, and this generation has been significantly impacted by the economy and unemployment.

Another likely culprit: The internet. Millennials also highly connected, heavy users of the internet, reducing the need to travel to do things like go to the movies, go shopping, or even go to school or work.