I've wondered about this as well, but don't fret about it. I'm pretty new to Spyders, having just bought my first one this past June and have about 4,000 miles on the odometer. I use an estimate of 33 mpg as a worst case estimate and never go over 200 miles before stopping for refueling. I find the Spyder very comfortable to ride, but rarely want to ride non-stop of over 3 hours before wanting at least a few minutes of break time, bathroom stop, etc. And unless I am on a high speed interstate highway non-stop, 3 hours of riding will not be over 200 miles. So far, about 5.5 gallons is the most that I have put into the tank at one time. If I were planning a trip out West, where long stretches without a place to fill up are common, I might look into those aluminum fuel bottles that were mentioned earlier in this thread. Even just half a gallon might be enough for peace of mind in a remote location.