I know pumps can be off, odometers can be off, and both can be off at the same time. I've kept track of my mpg since I bought the bike (2015), I also still have the data from my 2013 model.
2013: With 63 data fill ups: Average Fill up was at 196 miles, average gallons used to fill up was 4.39, average mpg was 44.7, using 6.08 gallons as the maximum capacity, the average distance I could go until I had 0.5 gallons left was 249 miles, and the average distance until completely empty would be 271miles (I never tested it).
2015: With 19 data fill ups: Average Fill up was at 197 miles (I'm pushing it 1 mile further than my 2013, I'm living on the edge
, average gallons was 4.62 to fill up the bike, average mpg was 42.7 (getting less mpg than on the 2013 but I think when I had the 2013, I kept it in touring mode most of the time, now I keep it in Sport), using 6.08 gallons as the maximum capacity, the average distance I could go until I had 0.5 gallons left was 238 miles, and the average distance until completely empty would be 259 miles (I never tested it).
On my way home today I saw the low light warning at 207 miles (a little later than usual) and I pushed it a little further than I normally do; I put in only 4.899 gallons which got me to thinking. I know some of you have shown that you have put in more gallons than what is listed for the ST, I've never come close, unless I plug in the Imperial Gallon amount.
So on the 2015: The amount I put in using 5.06 imperial gallons as the maximum capacity, the average distance I could go until I had 0.5 gallons left would be 194.5 miles, and the average distance until completely empty would be 216 miles (I never tested it). In theory, this sounds about what I'm seeing on the road, around 195 miles the low light comes on, so I have either 1.03 gallons or 0.86 imperial gallons remaining.
By using gallons, I could go 259 miles until I'm stuck on the side of the road, if using imperial gallons, I could only go 216 miles. The most I've ever put in the 2015 model is 5.08 gallons, a far cry from using the 6.08 gallons, but a tad over the capacity if using 5.06 imperial gallons.
So I guess what I'm wondering, is how many gallons are you guys/gals putting in when you fill up, I'm not asking everyone to go run their tank empty for me, but is the tank in the USA a true gallon or imperial gallon?