GM issue a TSB in 1985 saying that their vehicles were designed for E10 gas.
What’s Hyundai’s problem?
I can’t complain too much about the mighty Sonata, it’s the V6 version. Decent power,but nothing special. I bought it for $10.5K in 2009. It’s at 250K miles now, no significant issues and that is even after I had to put the whole right side back together after my son drove it into a light post. Still no transmission or engine issues. I’ll keep giving her the good gas.