For those interested, I took a gallon of gas in a jerry can, put it in the side, and off I went. With the range indicator saying I had 26 kms to go, I ran out of gas. I dumped the gallon in, and 10 minutes of cranking ( about 4 or 5 seconds per try), she fired back up. I'm off to Alaska in 5 weeks, so 3 this was a "need to know". In future I wont let it get below 50kms remaining.