G2Prius : Absolute maximum mpg @ 65 mph and beyond ?

I planned to aeromod a 2008 Prius with a full length boattail, smooth underbody, wheel skirts front and rear, reshaped nose, and removed mirrors and rear wiper / antenna.
However, after finding out more about how the hybrid system works, I have given up on the idea.
According to A.I. , the Prius does not allow the car to take advantage of aerodynamic modifications to the degree that other cars do.
A.I. estimates a maximum of less than 60 mpg at 65 mph even with extreme aeromodding.

So I'd like to ask what is the absolute maximum real time mpg you have seen from a G2 Prius at 65 mph and over ?

 

Not just A.I., but several absolutely brilliant minds over at EcoModder are saying this as well.
And not just one A.I. querry, but several confirm that the Prius hybrid system does not allow the engine to loaf along at low RPM while at high speed.
In a conventional car like a Honda Civic VX, or Insight, extreme aeromods could allow the engine to take advantage of lean burn even at speeds of 65 -75 mph and return MPG near or greater than 100 MPG..
Even without lean burn, a Civic with extreme aeromods, such as the AeroCivic could see over 70 MPG with it's base engine.
What I should have asked was is if there was a way to 'cheat' the G2 Prius into loafing along while at high speed, much the same way that coasting in neutral does in a conventional car.
What is the maximum MPG ypu guys have seen at 65 mph and over ?
Even with a tail wind while nearly falling down a mountain.
The way that it was explained to me is that the hybrid system will keep the engine at what it thinks is an optimal RPM to keep the batrery charged even if the engine could run at extremely low RPM due to aerodynamic changes.

I posted this in the wrong forum section.
I hastily posted withput noticing this is a forum that apparently is for the Prius Prime. ( That is the plug in version, correct ? )
I just saw the words " fuel economy " in the section name abd thought this was a sectiin for posting fuel economy questions.
I dont have a computer and do all of this on my tiny phone screen so im half blind too.

 

With one small motorcycle size mirror on the driver side, yes.
Only one door mirror is required in the U.S.
My 1993 Civic didn't even come with a passenger mirror. It was a factory option.
Regarding the other modifications, as you know, you must have all tailights and such at the rear of the boattail, as well as lights for the license plate. The plate can't be covered or angled back either.
Lighting or reflective markers are a good idea to have on the sides of the tail as well.
The third brake light must be visible too.
Technically, I guess an added tail becomes part of the vehicle structure, much like one of those oversize bumpers that mount to the existing bumper, but I add a legal safety flag to the back of my tail when I extend it out.
My tail is bolted to the inner bumper structure ( the frame )
Nothing that I have found says the flag can't be rigid, so I just tape it to the top rear section of the tail.
Anything past something like 24 " past the bumper needs a safety flag.
Bumper in this case being the end of the inner structure ( frame ) of the bumper, the plastic bumper cover on the body of the car, or the end of an added boattail ?
It depends on if the policeman is having a bad day.

 

I know a G2 Prius can get 60 or more MPG, but when people post this figure, it is an average.

I'm wondering about instant MPG at 65 mph and higher, and if there is a way to 'cheat' the hybrid system into letting the engine run at low rpm with aeromods.

Everything I am finding out ( and from extremely good sources ) says that the car is just not built for that. It's a low speed city car, and not a highway mileage champ.