My numbers are not guesswork. When I first got my FEH I had to pick up my wife at Dulles International Aiport. I don't like to park if I can help it.
So, as I went around the traffic circulation route, a nearly oval closed loop that is as level as you're going to get, I hit the trip odometer when it went on the battery and noted when the engine fired up. Since it was late in the evening the traffic was light, so the speed was a consistent 20-25 MPH
. I made something over 10 circuits of this loop that night. So the 2.5 on the trip odometer was repeated several times.
As it turns out over the years I've owned my FEH I've had the opportunity to repeat this test about every year or so. My results are consistent.
There was no guesswork involved. Post your own results but don't be so quick on the trigger when you don't have a clue how someone generates their info. You not only were guessing yourself, you were presuming someone else was just too stupid to be as good as you.