We just returned from Crater Lake, though I could have easily stayed a month. On the way back to Sutherlin, OR we averaged 31 MPG, a record for a gas powered Honda CRV. On the way up we averaged 21 MPG.
In seriousness we must of rolled from the lake to Glide, OR where we stopped at Muchies Cafe to get one of their famous Blackberry Shakes.
Rt. 138 is pretty much a no traffic road, a beautiful drive, loads of Forest service campgrounds and in good condition.
I'm sure most of the western
Fiberglass RVers have been there but for you Easterners. it's one of the best places to visit in the USA, it deserves plenty of time.