Proof that wind is the big factor in MPG.

To look at the OP's results in a different way, the subject of this thread could have been "Proof that speed is the big factor in MPG".

Stating the obvious, driving with a steady direct headwind results in the same aerodynamic drag as driving faster in a calm wind. Driving with a steady direct tailwind results in the same aerodynamic drag as driving slower in a calm wind. A 15mph headwind when driving at 60mph affects MPG similarly to driving at 75mph with no wind. Actually, driving 15mph faster will give worse MPG than a 15mph headwind, since wind is seldom steady and roads curve such that we are seldom driving directly into the wind for the entire trip.

We always drive down hill with the wind at our back.

Just think of the mileage we could see if this could be made practical. https://youtu.be/Xbjdmw8D9-Y. FWIW, when I'm in my =car=, I'll run up on a semi, then swing out and pass, basically slingshot, out of the draft, without slowing down. You can see the instant mileage go up as you close in, then drop off when you get beside them.

Lyle

Sounds about right on mileage.

As for the drafting big rigs (dumb idea...) and better mileage going South comment I really hope that was a joke.

RoyB wrote:
If the truckers will let you stay there whip in behind one of them and draft them. That works too...

Yikes.

If the truckers will let you stay there whip in behind one of them and draft them. That works too...

Also you always get better mileage going South then you do going North with the same wind. Something about always going uphill when going North here in North America... So they say...

I get GREAT gas mileage pulling my POPUP behind my F150. Not much wind hitting my trailer setup...

It is almost hard to tell if the truck gas mileages changes from when we are pulling the Popup trailer or not...

I can make Gatlinburg TN from Northern Neck VA on one tank of gas everytime...

We usually however gas up just south of Roanoke and grab a bite at Shoneys close by...

Oh I believe it.
We were heading west on I90 with huge head winds. I have EGT and boost gauges so I can tell how hard the truck is working. For several hours my gauge had the same readings as when I'm pulling a mountain pass.
I didn't even check the mileage - didn't want to know!

Interesting. Thanks for posting.