The MythBusters did that one, obviously the info is a bit out of date now but IIRC over the three decades of models they tested they found that motorcycles, while more fuel efficient per mile, have none of the pollution controls of cars so they put out more emissions per mile than the average car of the same age.
The MythBusters did that one, obviously the info is a bit out of date now but IIRC over the three decades of models they tested they found that motorcycles, while more fuel efficient per mile, have none of the pollution controls of cars so they put out more emissions per mile than the average car of the same age.
Those guys were awesome, that’s a solid thing to look into