An suv that gets that mileage i've never heard of except i guess the hybrids might be able to.
Also speed might impact like you said. Cause ive been doing 95 on the nj state pkwy. When i go to the casinos in ct i do 85 most of the way
That's what I get with uninterrupted highway driving on a one way 240 miles (I fill up on the way back from Boston just over the Conn/Mass border (Union) where there is a station that always has lowest prices.even though I have enough gas to make it back home) Actually I do not go into Boston but suburb right off hwy a bit N close to NH border.
BTW, wind drag increases dramatically (increases with the square of the velocity above a certain speed (I won't go into the physics) with the sweet spot for max efficiency (taking into account other losses starting to be taken over by wind drag) is around mid 50's to low 60's mph depending upon the shape of the vehicle, tire tire design and pressure, altitude and some other factors.
Your 85mph(and 95) is well past that spot resulting in a lot of wind drag resulting lower mpg regardless of gas or hybrid or EV (energy usage)