Originally Posted by revhigh
Although I don't believe this for a minute ... I'm gonna give it a try. My wife drives the car primarily, She averages a rock solid 33.5 MPG per tankful on her commute. I put 89 in the car today, and am not going to tell her. We'll see if it makes any difference in MPG over the next 3 or 4 tanks. After 3 or 4 tanks of 89 ... I'll try some 93 for the same amount of time.
We shall see .... :D Although I don't believe there will be any difference ... I truly hope that there is.
I hope it works for you. I really didn't think that there would be any difference but figured I would try it out just to see before throwing my opinion out.
That was over 5k miles ago...
The best bet, if you fill it up for the wife, is to wait until a few tanks of 93 have been run through and then swap her back to 87 and see if she thinks there is something wrong with the car