Pro and Cons of E85

I can count the number of well tuned cars I've seen WITHOUT an A/F meter on one hand...

Most of the cars were decent at idle and WOT, in between was usually a disaster.

Plenty of vehicles see a large increase in fuel economy after a good tune up with an A/F meter, especially cruise speeds.

I've observed the same results as another in the thread, e78, e85, e88, didn't change the way the car runs.