UPDATE:
I now have 8300 miles (actually 6900 that I drove). Second oil change. Still using about one quart per 2000 miles. I am spending $32 for an oil change and lube. If I did the work myself, it would cost me $15-20 in parts/oil. A good deal. On the other hand the Onan costs $50-60 to change about 11/2 quarts of oil and no filter (I guess there is no oil pump on the 3600rpm models - uses splash method of lubricating the bearings(?). That doesn't inspire confidence, but Onan warranties the unit for two years, so I don't care. I changed that myself. I "tried" to keep speed under 65 on highway in my commute last week and got 11mpg. I am going to drive 300 miles non-stop this week, and will force myself to cruise at 65. We'll see if those claims of 12 are realistic.
*This Message was edited on 05-May-02 10:40 PM by Daniel C.*