As John said, no problem with fuel. I had a small tank with me for emergencies, but even with the limited range of the GS I had no need for it. I was getting 40mpg; if your KLR's are going to be heavily loaded, count on 50mpg. The longest distance without fuel is Goose Bay to Churchill Falls, approximately 300km = 200 miles. The report installment on actual Trans-Lab is coming here in a few hours. Stay tuned.