Lower 4th gear is better that higher 3rd gear, Auto or Manual.

 

You will gain much more credibility with more accurate information. In other words, do you reset your trip meter with every fill up? If so you never listed how much fuel you used per trip. But dyno readings or assumptions are not accurate in addition to your data flying in the face of physics knowing that the faster you go the more power is necessary to overcome the force of resistance therefore the lower your MPG's....

I wouldn't discount your accounts, however without more data, you simply opened yourself up to the haters ..