I've had nothing but troubles with that tank since I've added it to my F650gs. It doesn't hold the advertised amount of fuel and the gaskets for the fuel lines leading into the primary tank are shit. Other than the overflow and evaporation issues I was having initially, It was a nice thing to have in Death Valley where fuel is around $6.00 a gallon. After about 12,000 miles of use the gasket started leaking and pissing fuel from my primary tank. They started to shrink when I got to about 9,900 ft in Tioga pass. I speculate that the elevation and the 20 degree temperature helped the leak along. There must be a better option for drilling into the stock tank though, six holes is a little much. I was worried that this would be a recurring theme and ended up replacing the stock tank. I still have the extended range tank on the bike but I drain it into an MSR fuel bottle and transfer it that way. If I had it to do over again I would just carry a 1 gallon jerry can.