I desired to spent an extra $ to put and extra gas tank on my 2007 K 1200 LT with Hannigan conversion, and I am very glad I done that because the summer of last year I took a trip to Yellowstone Park, I don't have to stop to fuel up all the time and I will keep up the ride with other bike. I am highly recommend if you have extras $ it worth it to have extra gas tank. I getting 32-35 mpg on the trike and other bike get between 48-50 mpg.