While it is true that the electronics can accomodate for most changes in octane, using a lower grade in a vehicle designed for a high grade can (doesn't always, but can) result in pinging. Pinging can damage your engine since it is really the piston wobbling in the cylinder.

So, use the lower if you want, but if you hear pinging, then put in the more expensive stuff.

I am not disagreeing with gonavy, but think it is important to know what the symptoms would be if any damage was being done. And don't worry, if it pings you will know it. It makes a real racket!

2005 Ford Escape Hybrid - Titanium Green, 4WD, Appearance Pkg, Leather, Nav System