The first lesson I learned was I am not prepared for a flat tire.
The second issue finding a better way to carry spare fuel.

It didn't last

My BMW GS 650 XChallenge has a 2.5 gallon tank. Off road I get 50 - 60 miles to the gallon. I try to fill up at 100 miles. Current record - I coasted into a gas station dry at 136 miles. 

The XChallenge also has no gas gauge. At each fill I reset the odometer to track how many miles on the current tank. The odometer counts the miles to empty. If I see triple digits I'd better be on my way to a pump.

That limited range is starting to frustrate me. When I'm out mapping, there is the expected route and frequently unexpected routes to explore. Plans change on the fly.

When 2 Bottles failed, i went back to 1

I Have Spare Fuel Now -

Camper fuel bottles have been my solution up to now. Each carries 15 -20 miles worth of fuel. They are cheap, available, and seemed pretty solid. Experience has proved otherwise.

I used to carry two 30 oz. bottles strapped to my tail rack with hose clamps. I reduced to one bottle when the hose clamps punched a hole in one of the bottles. Riding out on a flat this last trip I found the single fuel bottle falling out of the clamps and deeply creased and the cap leaking. That single fuel bottle is little more than moral support, barely adequate. It's time to re-evaluate this system.
 

Bad crease in one, hole in the other

Lesson Learned - I need to find a better solution

Step 1

I need to add a siphon hose to my kit. If someone comes by when I'm out of gas, and is willing to donate, I should carry the hose to make it easy.
 

Siphon hose added to kit

Step 2

Suggestions welcome. I'm currently drawn to the RotopaX Gasoline Packs. Even the smallest 1 gallon tank adds 50-60 miles of range and that's enough, but then I need to adapt how I carry things on top of it. The handle protrudes from the gas tank and my current top bag won't sit on it. Ideas?
 

Rotopax fuel tank

Photo shared from advlifestyle.com, link to article here - http://www.advlifestyle.com/2016/02/10/rotopax-fuel-container-for-the-dr350