I just bought my first motorcycle. It's a 1981 Suzuki GS550T. You can treat me like I have no idea what I'm talking about, but I know the bike gets 40-50 mpg. I looked up specs which said the fuel tank is 4.36 gallons, but today I ran it out of gas at about 95 miles after filling up. I then filled it back up with just over 2 gallons. Am I missing something? I'm fairly certain that the tank is the same one that came with the bike, but it either has a second compartment that I am unaware of, or doesn't actually have the capacity I've been lead to believe. Any help would be appreciated.Thanks!