I have an 05 f7 ext (144) and an 07 Crossfire 1000. In terms of the length of track when I'm on a trail, I don't notice it that much, since I've put so many miles on. Both sleds are studded, so I need some heavy duty carbides in the front. Overall it does well in the trails. You are probably not going to hang with short tracks that are built for trail riding, but with a 1000, all you need is one straight section of track and you are right on top of them.
In terms of gas/oil, my 1000 does better than my F7. If you're just out cruising, 55-60, this thing doesn't even work hard. I can see going through some gas if you're pounding on it, but the 1000 isn't the pig most people think it is. Torque is great, power is great. I have 4200 miles on my Crossfire, no issues but the valves being a little gummed up. I put a can on it to save a little weight too. She rocks.