Originally Posted by onestout
It would be tough to make up the difference of the added cost in fuel savings so I'll stick with the 87.
You ought to try it for a few tanks and see. The car will run and perform much better and you should see an increase in MPG's. I think at the worst it would be a net wash, money wise, with a better performing car. I only wish I could get E0 91. I run E10 91 and see about an 8% increase in MPG's, but the car is clearly happier, just like the owners manual says.