"driving a car that does have tail pipe emissions?"
And what's in those emissions you ask ? oh, you didn't ,but here they are anyways...lol.
N2- 71%
CO2- 14%
H2O-13%
For a grand total of 98%
see: en.wikipedia.org/wiki/Exhaust_gas#Main_motor_vehicle_emissions 
For the remaining 2% content
Sulphur content is basically zero , thanks to sulphur in gasoline legislation from about 17 years ago.Which allowed modern ICE engines to work the way they were designed without elemental sulphur to literally gum up the works.
All this worrying over plant food and water vapour.