American, German and Japanese cars, with some French ones. 
Most of the cars we saw were either Opel's Chevy versions, Nissan and an incredible amount of VW.  You will find a derelict Peugeot and Renault, and once in a while an older 70s car.  And the suspension systems!  Aye aye aye…  With roads mostly made of pavements, I think most taxis squeeze the useful life of suspensions well beyond safety.  In fact, our first drive into the city from the airport was in a bouncing taxi who would negotiate curves in a very hit or miss way. 

Ah, driving into Guanajuato is something that leaves an impression on you.  It would make the perfect movie.  Most of the traffic is underground due to an irrigation system put into place after a devastating 1905 inundation.  It was as if we were navigating an intricate labyrinth of catacombs at full speed on shot suspensions, dodging cars, sidewalk and other moving obstacle, such as humans.  Impressive! 

What was particularly disturbing was to see the huge amounts of GM cars here, when the same company begs for leniency at home.  GM has fuel efficient cars elsewhere.  How come they don't make small, affordable and fuel efficient home makes you wonder where their interest lies, or who is pushing them in that wrong direction.  One thing we are not told is that GM, Ford and Chrysler  abroad are doing very, very well with the introduction of a fuel cell car in China for GM, a hydrogen car, in other words despite the fact there are no infrastructure for dispensing hydrogen.  But guess who will be making hydrogen and by the same token a nice bundle?  Petroleum companies.  Clearly, these companies back home are despicable. 

What a city.