I just bought a used bx2350 (diesel) and mowed my grass with belly mower for the first time. The tank was full when I started and it took me about an hour to mow. when I was done I went to top of the tank and it took about 4 gallons to fill. according to the owners manual, the tank capacity is 6.6 gallons. Should 1 hour of cutting grass use that much fuel? Thanks