All I can tell you is that regardless of the bike I've ridden, flogging it impacted MPG in a harsh way...
2nd... The faster you go, the more gas you burn pushing the air around you. Case in point, at 50-55 MPH, I get 38 MPG on my Spyder... At 75 to 80 MPH I drop to 28 to 31 MPG.... I have a large front cross section compared to a regular bike, and a large touring shield. I have a 6 gallon tank... You do the math.
I know your question is hypothetical, but I really have to ask .... why ask? Your MPG pushing a liter bike flat out is going to be disappointing at best... I'd say high single digits to mid teens if you are lucky.
Lastly, there isn't a realistic way to ride that fast anywhere on public roadways for sustained lengths of time without being a hazard to yourself or others... Much less the impound and potential jail time.