Explain to me how towing in 4WD yields BETTER gas mileage than 2WD?

[Land_Shark]

Final answer: Gravity. Thread closed.

 

[MeefZah]

Lastly, you cannot give any credence to short trips like yours because they will not be accurate. Now, if you pulled the trailer across the US one way in 2WD and came back in 4WD then you could compare results.

Actually in this scenario the wind blowing east would severely effect the results!

 

[Knight-Errant]

Downhill vs Uphill.

I was going to say this....even though it looked flat, it is often the case that it isn't flat.