Am I on to something?

[AeroModder]

I'll look into that. I don't know if the Tempo's 2.3L has the same setup your 1.9L has, but I'll do some research into it.

Update: It's been 230 miles since I filled the tank, and I'm just now getting to a quarter tank. Usually I'm at the 1/6 mark or coming close to E by now! A quick estimate puts me at 27 MPG for this tank, but we'll see what the final number is when I fill it up sometime next week, probably Monday night.