New tank, 33.4 mpg!
Skipped a highway drive for a twisty mountain road drive where I just slid it into 5th gear and rolled along without touching brakes as much as possible. Speed was about 35mph instead of the 55 I do on the highway, I think that's what made the difference.
Changed oxygen sensors with a quarter tank left, car doesn't smell as bad anymore, hoping for 35mpg this next tank
If the rain stops tomorrow I think I'll tuft test a bit.