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Both of them have something seriously wrong with them..
I can achieve that on my 1100 sport, although it doesn't take very long to cover the 26 miles.
Can's say anything if the bike has carb, but if it is fuel injected, sharp decline in MPG (given no fuel leak, no misfiring cylinder, normal tire pressure) is almost always caused by defective oxygen lambda sensor. Stuck open O2 sensor "tells" CPU that the mixture is too lean and CPU makes injectors to deliver longer squirts of fuel. Hence the poor MPG.
I have no idea what mileage my Norge gets. I purposefully ignore that.
Oh, it's all tuned up, but I ride around town mostly and those stoplights eat most of the gas.