We have a very low milage 1995 GVW. According to the original owner, it was only driven by a little old lady, once a week to go to Church
At any rate we love it, very good quality and great fun. It has a V8, Dodge, engine that on a 6000 Km trip this past September averaged 17.3 Mpg (Imperial gallons). This quite accurate as I keep careful records. The van had one deep cycle house battery and we found that it was not capable of powering our furnace for all night in the chilly weather that we encountered. As a result I installed two 6 volt golf cart batteries and set up a solar panel charging system. Although the batteries do power the furnace all night in our cold winter excursions, due to North coast B C weather, and the angle of the sun in winter, I cannot honestly say the solar panel charging works too well. I expect much better results in the summer. I think that the real answer may be in obtaining a small generator. I am certain that you will enjoy your GWV. We certainly do.