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There is such a service in Europe, called Bla Bla Car[0].

There's a Montréal-Toronto facebook group with 18k members I've used a few times to save on gas money. Typically people charge $30-$40 per seat for the 6 hour trip.

I drove a guy who was trying to make an app which would do this, but I can't remember what it was called. It started as a Vancouver-Whistler ride share e-mail list.

This sounds like BlaBlaCar which is (I hear) popular in Europe.

it's relatively popular.