You may find the early posts here interesting:

http://www.soultravelers3.com/

Couple from California with a young dayghter RVing in Europe.

@thursdaysd this looks very interesting indeed. Thank you very much.

All the advice we can get is welcome ;)

I wish I could offer additional advice but you have certainly done your homework. It is a pleasure to see someone who has done such advanced work.

Out of curiousity I find this chart which is instructive as to the gas prices throughout Europe.

http://en.rian.ru/infographics/20130418/180709388.html

BTW, the price of gas was astonishly high in Turkey but the roads were well signed and easy to negotiate.