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Damned right I framed it ! 

Conversion; 4.54L per Gal.
.6214K/per mile 
The exact same ride at 120-140kph -  44.7 mpg.
Sorry....I don't "do" Liters per 100 kilometers. 
 
The same weekend I did a short ride of  87K on the back-country roads.  "Twisting it" like an adolescent boy; I got  27.4 MPG !   The fuel needle dropped faster then the "Titan".
 

 

I'll assume there was no implosion at the end of the run ( unlike the Titan ) since you lived to tell the tale.
Gotta like those numbers. Pretty sure you own the pole position in the fuel mileage category. Congrats !!

I had to convert to US to see how that compares.  I was able to pull off a 46 miles per US gallon once which is close to yours, but that was with a low speed and sustained tail wind.

I tried to convert to litres per 100 km. Got 6,11 from Scotch´s data. Guess that is a good value, you probably won´t make it below unless you go slow to save fuel. That is roughly what I use.

regards from metric Europe ...
Holger

Just a little off with the math Holger. He traveled 272.7 Kilometers using 13.285 liters. 272.7 KM= 2.727  100KM

13.285 liters / 2.727 (100 km) = 4.87 L/100 KM
 

Ah, the joys of Imperial gallons vs U.S. Gallons vs Liters per 100 kilometers vs miles per gallon !
That's why I stay Ole School with M.P.G.  I simply can't grasp kilometers per liter.

Even simpler:  When it quits.....you're close to empty......switch to Reserve.  When that quits....your walking !   While hiking to the closest gas station you can calculate steps per 100 meters !