Most riders get around 28-30 mpg, which gives 130-140 miles before the low fuel light comes on. At that point you have 30-50 miles of wiggle room. Pulling a trailer or riding in the mountains or at higher speeds will give you less. I have had a low fuel light in as few as 80 miles, or as much as 150...although I seldom run down all the way to the fuel light. I figure 25 mpg and 5 usable gallons, just to be safe, which means I fill every 100-125 miles or so, although I have gone over 140. Like learning to ride the Spyder, it takes some adjustments to accept having half the range, but it is worth the effort.