OK well I flew around the Denali range in Alaska.  Took off with everything set to 40% fuel.  I flew about 150km and all but 1 engine went dead because they ran out of fuel, but yet I had 35% fuel left.  I'm sorry but the fuel system here is way to confusing and out of all my add-on planes is the only one that gives me problems. To me the only reason any of my engines should go dead is because fuel level reaches 0%.  Hopefully the fuel will be addressed in patch, but until then I'm grounding the fleet.  :'(