While such a change will not be affecting my play of the game. I don't think that a change to the fuel capacities is in order. The designer assigned the given values for a reason, whether it is historical accuracy, playability or the preponderance of blue green algae on the fourth moon of Jupiter, is of no consequence.
The game as designed gives a Fokker 37 points of fuel. To alter this, alters the game and in my opinion would require that the name of the game be changed as well, as it would no longer be Blue Max.