My E320 (104) runs just fine on mid grade. 25 MPG on the highway, mostly highway driving. I know it offends the purists.

I also knew you'd catch hell for quoting our SC fuel prices. We have always been about the lowest in the country.

__________________
Jeff

97 E320, ours 217,000miles
91 190E 2.6 daily driver 242,000miles
74 MGB,mine 120,000?
2006 BE350/Proline 21, 50 hours