Also, a friend of mine has '10 MDX and he also put in regular gas and hasn't reported any issues yet.

Perhaps you should watch this: http://www.cbc.ca/marketplace/episod...mpfiction.html

Found it very interesting. There is no advantage to using a higher-level octane fuel.

One thing for sure...the worst thing you can do is alternate back and forth from regular to super. Your car's computer may take a few fillups to adjust and switching repeatedly will never allow it time.