Don't forget, our friends in the South American parts.  
 
"The largest single use of ethanol is as a motor 
fuel and 
fuel additive. More than any other major country, 
Brazil relies on ethanol as a motor fuel. 
Gasoline sold in Brazil contains at least 25% 
anhydrous ethanol. Hydrous ethanol (about 95% ethanol and 5% water) can be used as fuel in more than 90% of new cars sold in the country. Brazilian ethanol is produced from 
sugar cane and noted for high 
carbon sequestration.
[63] The US uses Gasohol (max 10% ethanol) and E85 (85% ethanol) ethanol/gasoline mixtures."
 
 
My friend runs it in his 2010 VW Golf there.  No problems.  So cars can be made to run on it without total failures.  However out old cars need a lot of work to make them happy about it.  Tank, lines (metal and rubber) and carb, fuel pump and intake are the most damaged parts.  All can be replaced and converted to accept the new fuels. But I would rather not.  It's expensive and it will never run the same.