I have 7k on my EX and have been very happy with the MPG. Fortunately, the majority of the miles I drive are highway miles. I also do not have significant hills in D/FW. I am averaging overall 25.5 mpg. I have not had to replace my fuel pump so I can't comment on before/after a new pump.

I always believed that a higher octane would increase your mpg too. I have witnessed that a lower octane gas has not affected my mpg. The car will run better (when accelerating to warp speed) on higher octane's but mpg were not an obvious improvement. I am and have been using 87 octane the last 10 times and have not lost any mpg. In fact, the best mpg I recorded was 27 and it was with 87 octane. I imagine traffic was good to me during that week.
My driving habits have extremely affected my mpg though. It is amazing how bad your mpg can be with this Station Wagon/Race Car. (on a side note, is it "effected" or "affected"?)

I do wonder though, the first 3 months I was using 93 octane, when it was a newer vehicle. I then switched to the lower octane after 3 months (after the break in period). I wonder if the new car break in period limited my mpg? This should be answered by someone who knows more about cars.

Anyway, there is my MPG Diary.

__________________
-Kevin