So I'm planning a ride to Alaska and back next May/June on my F650GS. Need to increase the distance I can ride between fill ups to about 400 miles I've heard. Other than carrying jerry cans, what options or systems are out there y'all can recommend? I know Touratech has an extra tank that goes replaces the top and side panels but its $1700 which is too much for me to spend.
Thanks in advance.