Not stupid at all, but that is where the tool kit goes and I would be positioning the canister where I would have to take all my gear off to get to the spare fuel. Me thinks I am going to fill a collapsible bag with three litres of fuel and dump it in as soon as I have room in the tank. I tried a nalgene collapsible water container with gasoline in it and there was no drips or eating away of said bag. That would ensure thirty miles more from the mileage that I allready am getting. My trial was at less than 500 feet above sea level and the actuall area that I need the great mileage at is at 7000 feet above. I do not know how much this effects mileage but my gut says it will get much less mileage at elevation. Once again the warning light never came on in the test and I have had the warning light come on at less than 100 miles on many previous excursions. If the tank is truly five gallons, I should have enough to travel 222 miles to the last drop. This is a lonely stretch of hi-way in the middle of podunkville. If I run out of fuel, which now looks highly unlikely, I will be walking a mighty long way.