Thats the thing, we regularly do 100+ miles in Maine, and the gas is often hard to find, the farther out you get. Even my etec would burn through a tank in less than 100 miles if the going was hard. The Powderkeg and MA cans/small Burandt bag looks like it might fit the bill.I have a rail mounted gas can holder that works great. However, I quit using it since the Pros (11 and 13) that I owned did not need extra fuel for the type of riding that I was doing. I could not see why I should add weight to the back of the sled when I didn't need it. A hard day of riding in the Idaho backcountry for me still leaves me with enough leftover fuel in the tank. I can see needing it if you are putting in 75+ mile days but less than that and you probably don't need it.