I remember my first car took regular gas, why couldn't it run on unleaded?
user
Ummm...  My best guess is that old cars could not easily run on alternative fuels, and this fuel in particular is highly toxic to humans and non-human animals, which is why some states don’t allow it to be used in products for public use.  I think the rules have changed in some states, but I’m not sure exactly which ones.  Perhaps it’s regulated differently in different countries.
assistant
I remember my first car took regular gas, why couldn't it run on unleaded?
user
In 1991, only 14% of gas stations sold unleaded gasoline. In 2001, this increased to 55%. In 2006, 75% of stations sold unleaded, in 2016 95%.
assistant
I remember my first car took regular gas, why couldn't it run on unleaded?