The problem with longer runs on the trip computer is the gen and webasto throw the numbers off. I clear the trip at each fueling and also compare the pro driver miles to the odometer. In the last few weeks, I have put 90 hrs on the gen and some webasto time, as well as traveling through WV and PA, so I know that is effecting my log mpg and the pro driver on some legs.

I agree the terrain, winds and star alignment effect the mpg, but for the most part, I can get pretty close in estimating how far I can go before worrying about fueling.

I also wanted potential 8V buyers/owners to know that a well running 8V can produce decent fuel numbers as long as speed is controlled. Would my numbers be less if towing a big trailer or Hummer, absolutely.

Sid - Sounds about right based on my previous 60's and I'm sure you were in the hills.