AI,
Fuel burn per hour for any aircraft is useless information as long as you don't use the same set of parameters for the aircraft you compare.
Examples:
Aircraft A burns x lb/kg fuel, but carries x1 lb/kg payload
Aircraft B burns y lb/kg fuel, but carries y1 lb/kg payload, which may be very different from the payload A carries.
Aircraft A flies on route x
Aircraft B flies on route y. One may be long-haul, the other short-haul, winds will be different, fuel on board will be different due to both sector length and alternate fuel. Different fuel loads result in different aircraft take-off weights (in addition to the aircraft specific empty weight and the payload) and in different fuel burns. The higher the weight, the higher the fuel burn, even if all other factors are identical.
There are other factors but I think this will give you an idea that fuel burn comparisons are a complex thing.