Good morning Paul.
I was doing a lot of experimenting on the trip to Argos . It ended up being just over 1300 miles pulling a small trailer with wood and a lot of camping gear ect. I had planed on using a tank of gasoline going up and one coming back.
I was very satisfied with the performance and speed of the truck . Most of the route was on the big roads and needed to drive speeds 60-70 mph to stay with the flow of traffic.
Because of the long open road I decided to experiment running gasoline and blend in wood to stretch the mileage . I was very conservative on the temps I allowed the gasifier to reach . (450- 500F on the rails , measured about 18 inches from the entrance of the drop box )
The wood was a mixture of oak and pine and the hopper will hold 60-75 pound and would run 125 -140 miles per fill in hybrid mode .
The truck is a 4x4 and about a ton heaver than the Dakotas but the problem on the high speed open road is the wind drag. ( high and wide truck , kinda like having a parashoot tied on the rear of a dakota as far as wind drag )
I think if this truck was driven 100% gasoline it would get 12-15 miles per gallon . Adding wood I was able to average 30 miles per gallon.
I will be taking a look at my fire tube and try to get an idea of where I should draw the line as far as max temp . If I decide I can go another 100 degrees hotter it will increase my mileage a lot.
If not for camping gear and supplies we could have made the trip with just the wood in the truck.
Again , very satisfied with speed and performance Disappointed in the gasoline used Next year I will be driving a Dakota .