Yeah that is some awesome range and fuel economy, I remember Macdoc posting stuff about the trip out West and the range they were getting and was feeling envious. I get about 350 k's, but that is with 6 gallon tank (22 litres), at about 5.6 l/100. In a Facebook group a Goldwing owner posted they were getting 500k from a tank...I thought that was amazing. But ya the peanut tank on Sportsters isn't great, but that can be swapped out as well.