I have always carried extra fuel I’m just looking for the most effective machine. My cabin is a long ways from the black top the less efficient a machine is means the less I can use it when I get out there. Fuel is a precious commodity in the bush.
Right, I get that. Just you were asking range, not overall economy.
Are you going to be using this to haul materials? Or is it simply a mode of transportation. If only transportation, with very light loads, then maybe the 570, but otherwise you are going to want the 1000.
It's going to take x-amount of power to turn those tracks, the 1000 has more torque and it's going to roll them over easier, requiring less throttle input which will probably equal about the same amount of air/fuel. Basically it's going to take this much air and this much fuel to make this much power. It's going to take a similar amount of power to turn the tracks on both machines. Whereas with just tires it takes a lot less power to just run the machine around, and the lighter machine wins.
I wonder if a snowmobile and an atv would work better. Both kinda purpose built, rather than one that kinda sucks for both. Utv's are heavy, put a lot more weight on tires the same size as an atv, they are also quick to get high centered with the longer wheel base. A snowmobile is just that, a vehicle for getting around in the snow, and it's pretty good at it.
In the right conditions a utv is great, but I'm not sold on the tracks unless it's just a whole lotta swamp, and I think then you will just be getting stuck further away from everything.
Maybe you have already experimented with atv's and snowmobiles.