I've run AMOCO 87 octane since day one, and have had no problems. MPG is still near 30, and the engine still runs as if it has 14K miles instead of 104K.
Martin
My Profile
2000 Contour SE V6 ATX 170K miles
Hecho en Mexico
Steel blue w/greystone interior
1997 Volvo 850 Wagon 146K